Better chest handling

worldedit-bukkit/adapters/adapter-1_19_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_19_R3/PaperweightFaweMutableBlockPlaceContext.java

@@ -14,20 +14,21 @@ import net.minecraft.world.phys.Vec3;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
-public class FaweMutableBlockPlaceContext extends BlockPlaceContext {
+public class PaperweightFaweMutableBlockPlaceContext extends BlockPlaceContext {
 
-    private static final BlockHitResult DEFAULT_BLOCK_HIT = new BlockHitResult(new Vec3(
+    private static final BlockHitResult DEFAULT_BLOCK_HIT = new BlockHitResult(
-            Integer.MAX_VALUE,
+            new Vec3(Integer.MAX_VALUE, Integer.MAX_VALUE, Integer.MAX_VALUE),
-            Integer.MAX_VALUE,
+            Direction.NORTH,
-            Integer.MAX_VALUE
+            new BlockPos(Integer.MAX_VALUE, Integer.MAX_VALUE, Integer.MAX_VALUE),
-    ), Direction.NORTH, BlockPos.ZERO, false);
+            false
+    );
     private final ServerLevel level;
     private BlockHitResult hitResult = null;
     private Direction direction = null;
     private BlockPos relativePos;
 
     @SuppressWarnings("DataFlowIssue")
-    public FaweMutableBlockPlaceContext(ServerLevel level) {
+    public PaperweightFaweMutableBlockPlaceContext(ServerLevel level) {
         super(
                 level,
                 null,
@@ -40,7 +41,7 @@ public class FaweMutableBlockPlaceContext extends BlockPlaceContext {
         this.replaceClicked = false;
     }
 
-    public FaweMutableBlockPlaceContext withSetting(BlockHitResult hitResult, Direction direction) {
+    public PaperweightFaweMutableBlockPlaceContext withSetting(BlockHitResult hitResult, Direction direction) {
         this.hitResult = hitResult;
         this.direction = direction;
         this.relativePos = hitResult.getBlockPos().relative(hitResult.getDirection());

worldedit-bukkit/adapters/adapter-1_19_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_19_R3/PaperweightPlacementStateProcessor.java

@@ -24,13 +24,13 @@ public class PaperweightPlacementStateProcessor extends PlacementStateProcessor
     private final PaperweightFaweAdapter adapter = ((PaperweightFaweAdapter) WorldEditPlugin
             .getInstance()
             .getBukkitImplAdapter());
-    private final FaweMutableBlockPlaceContext mutableBlockPlaceContext;
+    private final PaperweightFaweMutableBlockPlaceContext mutableBlockPlaceContext;
     private final PaperweightLevelProxy proxyLevel;
 
     public PaperweightPlacementStateProcessor(Extent extent, BlockTypeMask mask, Region region) {
         super(extent, mask, region);
         this.proxyLevel = PaperweightLevelProxy.getInstance(this);
-        this.mutableBlockPlaceContext = new FaweMutableBlockPlaceContext(proxyLevel);
+        this.mutableBlockPlaceContext = new PaperweightFaweMutableBlockPlaceContext(proxyLevel);
     }
 
     private PaperweightPlacementStateProcessor(
@@ -43,7 +43,7 @@ public class PaperweightPlacementStateProcessor extends PlacementStateProcessor
     ) {
         super(extent, mask, crossChunkSecondPasses, threadProcessors, region, finished);
         this.proxyLevel = PaperweightLevelProxy.getInstance(this);
-        this.mutableBlockPlaceContext = new FaweMutableBlockPlaceContext(proxyLevel);
+        this.mutableBlockPlaceContext = new PaperweightFaweMutableBlockPlaceContext(proxyLevel);
     }
 
     @Override

worldedit-bukkit/adapters/adapter-1_20/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R1/PaperweightFaweMutableBlockPlaceContext.java

@@ -14,20 +14,21 @@ import net.minecraft.world.phys.Vec3;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
-public class FaweMutableBlockPlaceContext extends BlockPlaceContext {
+public class PaperweightFaweMutableBlockPlaceContext extends BlockPlaceContext {
 
-    private static final BlockHitResult DEFAULT_BLOCK_HIT = new BlockHitResult(new Vec3(
+    private static final BlockHitResult DEFAULT_BLOCK_HIT = new BlockHitResult(
-            Integer.MAX_VALUE,
+            new Vec3(Integer.MAX_VALUE, Integer.MAX_VALUE, Integer.MAX_VALUE),
-            Integer.MAX_VALUE,
+            Direction.NORTH,
-            Integer.MAX_VALUE
+            new BlockPos(Integer.MAX_VALUE, Integer.MAX_VALUE, Integer.MAX_VALUE),
-    ), Direction.NORTH, BlockPos.ZERO, false);
+            false
+    );
     private final ServerLevel level;
     private BlockHitResult hitResult = null;
     private Direction direction = null;
     private BlockPos relativePos;
 
     @SuppressWarnings("DataFlowIssue")
-    public FaweMutableBlockPlaceContext(ServerLevel level) {
+    public PaperweightFaweMutableBlockPlaceContext(ServerLevel level) {
         super(
                 level,
                 null,
@@ -40,7 +41,7 @@ public class FaweMutableBlockPlaceContext extends BlockPlaceContext {
         this.replaceClicked = false;
     }
 
-    public FaweMutableBlockPlaceContext withSetting(BlockHitResult hitResult, Direction direction) {
+    public PaperweightFaweMutableBlockPlaceContext withSetting(BlockHitResult hitResult, Direction direction) {
         this.hitResult = hitResult;
         this.direction = direction;
         this.relativePos = hitResult.getBlockPos().relative(hitResult.getDirection());

worldedit-bukkit/adapters/adapter-1_20/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R1/PaperweightPlacementStateProcessor.java

@@ -24,13 +24,13 @@ public class PaperweightPlacementStateProcessor extends PlacementStateProcessor
     private final PaperweightFaweAdapter adapter = ((PaperweightFaweAdapter) WorldEditPlugin
             .getInstance()
             .getBukkitImplAdapter());
-    private final FaweMutableBlockPlaceContext mutableBlockPlaceContext;
+    private final PaperweightFaweMutableBlockPlaceContext mutableBlockPlaceContext;
     private final PaperweightLevelProxy proxyLevel;
 
     public PaperweightPlacementStateProcessor(Extent extent, BlockTypeMask mask, Region region) {
         super(extent, mask, region);
         this.proxyLevel = PaperweightLevelProxy.getInstance(this);
-        this.mutableBlockPlaceContext = new FaweMutableBlockPlaceContext(proxyLevel);
+        this.mutableBlockPlaceContext = new PaperweightFaweMutableBlockPlaceContext(proxyLevel);
     }
 
     private PaperweightPlacementStateProcessor(
@@ -43,7 +43,7 @@ public class PaperweightPlacementStateProcessor extends PlacementStateProcessor
     ) {
         super(extent, mask, crossChunkSecondPasses, threadProcessors, region, finished);
         this.proxyLevel = PaperweightLevelProxy.getInstance(this);
-        this.mutableBlockPlaceContext = new FaweMutableBlockPlaceContext(proxyLevel);
+        this.mutableBlockPlaceContext = new PaperweightFaweMutableBlockPlaceContext(proxyLevel);
     }
 
     @Override

worldedit-bukkit/adapters/adapter-1_20_2/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R2/PaperweightFaweMutableBlockPlaceContext.java

@@ -14,20 +14,21 @@ import net.minecraft.world.phys.Vec3;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
-public class FaweMutableBlockPlaceContext extends BlockPlaceContext {
+public class PaperweightFaweMutableBlockPlaceContext extends BlockPlaceContext {
 
-    private static final BlockHitResult DEFAULT_BLOCK_HIT = new BlockHitResult(new Vec3(
+    private static final BlockHitResult DEFAULT_BLOCK_HIT = new BlockHitResult(
-            Integer.MAX_VALUE,
+            new Vec3(Integer.MAX_VALUE, Integer.MAX_VALUE, Integer.MAX_VALUE),
-            Integer.MAX_VALUE,
+            Direction.NORTH,
-            Integer.MAX_VALUE
+            new BlockPos(Integer.MAX_VALUE, Integer.MAX_VALUE, Integer.MAX_VALUE),
-    ), Direction.NORTH, BlockPos.ZERO, false);
+            false
+    );
     private final ServerLevel level;
     private BlockHitResult hitResult = null;
     private Direction direction = null;
     private BlockPos relativePos;
 
     @SuppressWarnings("DataFlowIssue")
-    public FaweMutableBlockPlaceContext(ServerLevel level) {
+    public PaperweightFaweMutableBlockPlaceContext(ServerLevel level) {
         super(
                 level,
                 null,
@@ -40,7 +41,7 @@ public class FaweMutableBlockPlaceContext extends BlockPlaceContext {
         this.replaceClicked = false;
     }
 
-    public FaweMutableBlockPlaceContext withSetting(BlockHitResult hitResult, Direction direction) {
+    public PaperweightFaweMutableBlockPlaceContext withSetting(BlockHitResult hitResult, Direction direction) {
         this.hitResult = hitResult;
         this.direction = direction;
         this.relativePos = hitResult.getBlockPos().relative(hitResult.getDirection());

worldedit-bukkit/adapters/adapter-1_20_2/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R2/PaperweightPlacementStateProcessor.java

@@ -24,13 +24,13 @@ public class PaperweightPlacementStateProcessor extends PlacementStateProcessor
     private final PaperweightFaweAdapter adapter = ((PaperweightFaweAdapter) WorldEditPlugin
             .getInstance()
             .getBukkitImplAdapter());
-    private final FaweMutableBlockPlaceContext mutableBlockPlaceContext;
+    private final PaperweightFaweMutableBlockPlaceContext mutableBlockPlaceContext;
     private final PaperweightLevelProxy proxyLevel;
 
     public PaperweightPlacementStateProcessor(Extent extent, BlockTypeMask mask, Region region) {
         super(extent, mask, region);
         this.proxyLevel = PaperweightLevelProxy.getInstance(this);
-        this.mutableBlockPlaceContext = new FaweMutableBlockPlaceContext(proxyLevel);
+        this.mutableBlockPlaceContext = new PaperweightFaweMutableBlockPlaceContext(proxyLevel);
     }
 
     private PaperweightPlacementStateProcessor(
@@ -43,7 +43,7 @@ public class PaperweightPlacementStateProcessor extends PlacementStateProcessor
     ) {
         super(extent, mask, crossChunkSecondPasses, threadProcessors, region, finished);
         this.proxyLevel = PaperweightLevelProxy.getInstance(this);
-        this.mutableBlockPlaceContext = new FaweMutableBlockPlaceContext(proxyLevel);
+        this.mutableBlockPlaceContext = new PaperweightFaweMutableBlockPlaceContext(proxyLevel);
     }
 
     @Override

worldedit-bukkit/adapters/adapter-1_20_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R3/PaperweightFaweMutableBlockPlaceContext.java

@@ -14,33 +14,29 @@ import net.minecraft.world.phys.Vec3;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
-public class FaweMutableBlockPlaceContext extends BlockPlaceContext {
+public class PaperweightFaweMutableBlockPlaceContext extends BlockPlaceContext {
 
-    private static final BlockHitResult DEFAULT_BLOCK_HIT = new BlockHitResult(new Vec3(
+    private static final BlockHitResult DEFAULT_BLOCK_HIT = new BlockHitResult(
-            Integer.MAX_VALUE,
+            new Vec3(Integer.MAX_VALUE, Integer.MAX_VALUE, Integer.MAX_VALUE),
-            Integer.MAX_VALUE,
+            Direction.NORTH,
-            Integer.MAX_VALUE
+            new BlockPos(Integer.MAX_VALUE, Integer.MAX_VALUE, Integer.MAX_VALUE),
-    ), Direction.NORTH, BlockPos.ZERO, false);
+            false
+    );
     private final ServerLevel level;
     private BlockHitResult hitResult = null;
     private Direction direction = null;
     private BlockPos relativePos;
 
     @SuppressWarnings("DataFlowIssue")
-    public FaweMutableBlockPlaceContext(ServerLevel level) {
+    public PaperweightFaweMutableBlockPlaceContext(ServerLevel level) {
-        super(
+        super(level, null, null, null, DEFAULT_BLOCK_HIT
-                level,
-                null,
-                null,
-                null,
-                DEFAULT_BLOCK_HIT
 
         );
         this.level = level;
         this.replaceClicked = false;
     }
 
-    public FaweMutableBlockPlaceContext withSetting(BlockHitResult hitResult, Direction direction) {
+    public PaperweightFaweMutableBlockPlaceContext withSetting(BlockHitResult hitResult, Direction direction) {
         this.hitResult = hitResult;
         this.direction = direction;
         this.relativePos = hitResult.getBlockPos().relative(hitResult.getDirection());

worldedit-bukkit/adapters/adapter-1_20_4/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R3/PaperweightPlacementStateProcessor.java

@@ -24,13 +24,13 @@ public class PaperweightPlacementStateProcessor extends PlacementStateProcessor
     private final PaperweightFaweAdapter adapter = ((PaperweightFaweAdapter) WorldEditPlugin
             .getInstance()
             .getBukkitImplAdapter());
-    private final FaweMutableBlockPlaceContext mutableBlockPlaceContext;
+    private final PaperweightFaweMutableBlockPlaceContext mutableBlockPlaceContext;
     private final PaperweightLevelProxy proxyLevel;
 
     public PaperweightPlacementStateProcessor(Extent extent, BlockTypeMask mask, Region region) {
         super(extent, mask, region);
         this.proxyLevel = PaperweightLevelProxy.getInstance(this);
-        this.mutableBlockPlaceContext = new FaweMutableBlockPlaceContext(proxyLevel);
+        this.mutableBlockPlaceContext = new PaperweightFaweMutableBlockPlaceContext(proxyLevel);
     }
 
     private PaperweightPlacementStateProcessor(
@@ -43,12 +43,18 @@ public class PaperweightPlacementStateProcessor extends PlacementStateProcessor
     ) {
         super(extent, mask, crossChunkSecondPasses, threadProcessors, region, finished);
         this.proxyLevel = PaperweightLevelProxy.getInstance(this);
-        this.mutableBlockPlaceContext = new FaweMutableBlockPlaceContext(proxyLevel);
+        this.mutableBlockPlaceContext = new PaperweightFaweMutableBlockPlaceContext(proxyLevel);
     }
 
     @Override
     protected char getStateAtFor(
-            int x, int y, int z, BlockState state, Vector3 clickPos, Direction clickedFaceDirection, BlockVector3 clickedBlock
+            int x,
+            int y,
+            int z,
+            BlockState state,
+            Vector3 clickPos,
+            Direction clickedFaceDirection,
+            BlockVector3 clickedBlock
     ) {
         Block block = ((PaperweightBlockMaterial) state.getMaterial()).getBlock();
         Vec3 pos = new Vec3(clickPos.x(), clickPos.y(), clickPos.z());

worldedit-bukkit/adapters/adapter-1_20_5/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R4/PaperweightFaweMutableBlockPlaceContext.java

@@ -14,20 +14,21 @@ import net.minecraft.world.phys.Vec3;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
-public class FaweMutableBlockPlaceContext extends BlockPlaceContext {
+public class PaperweightFaweMutableBlockPlaceContext extends BlockPlaceContext {
 
-    private static final BlockHitResult DEFAULT_BLOCK_HIT = new BlockHitResult(new Vec3(
+    private static final BlockHitResult DEFAULT_BLOCK_HIT = new BlockHitResult(
-            Integer.MAX_VALUE,
+            new Vec3(Integer.MAX_VALUE, Integer.MAX_VALUE, Integer.MAX_VALUE),
-            Integer.MAX_VALUE,
+            Direction.NORTH,
-            Integer.MAX_VALUE
+            new BlockPos(Integer.MAX_VALUE, Integer.MAX_VALUE, Integer.MAX_VALUE),
-    ), Direction.NORTH, BlockPos.ZERO, false);
+            false
+    );
     private final ServerLevel level;
     private BlockHitResult hitResult = null;
     private Direction direction = null;
     private BlockPos relativePos;
 
     @SuppressWarnings("DataFlowIssue")
-    public FaweMutableBlockPlaceContext(ServerLevel level) {
+    public PaperweightFaweMutableBlockPlaceContext(ServerLevel level) {
         super(
                 level,
                 null,
@@ -40,7 +41,7 @@ public class FaweMutableBlockPlaceContext extends BlockPlaceContext {
         this.replaceClicked = false;
     }
 
-    public FaweMutableBlockPlaceContext withSetting(BlockHitResult hitResult, Direction direction) {
+    public PaperweightFaweMutableBlockPlaceContext withSetting(BlockHitResult hitResult, Direction direction) {
         this.hitResult = hitResult;
         this.direction = direction;
         this.relativePos = hitResult.getBlockPos().relative(hitResult.getDirection());

worldedit-bukkit/adapters/adapter-1_20_5/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_20_R4/PaperweightPlacementStateProcessor.java

@@ -31,7 +31,7 @@ public class PaperweightPlacementStateProcessor extends PlacementStateProcessor
             .getInstance()
             .getBukkitImplAdapter());
     private final PaperweightLevelProxy proxyLevel;
-    private final FaweMutableBlockPlaceContext mutableBlockPlaceContext;
+    private final PaperweightFaweMutableBlockPlaceContext mutableBlockPlaceContext;
 
     public PaperweightPlacementStateProcessor(Extent extent, BlockTypeMask mask, Region region) {
         super(extent, mask, region);
@@ -47,7 +47,7 @@ public class PaperweightPlacementStateProcessor extends PlacementStateProcessor
             bukkitWorld = (BukkitWorld) world;
         }
         this.proxyLevel = PaperweightLevelProxy.getInstance(((CraftWorld) bukkitWorld.getWorld()).getHandle(), this);
-        this.mutableBlockPlaceContext = new FaweMutableBlockPlaceContext(proxyLevel);
+        this.mutableBlockPlaceContext = new PaperweightFaweMutableBlockPlaceContext(proxyLevel);
     }
 
     private PaperweightPlacementStateProcessor(
@@ -61,7 +61,7 @@ public class PaperweightPlacementStateProcessor extends PlacementStateProcessor
     ) {
         super(extent, mask, crossChunkSecondPasses, threadProcessors, region, finished);
         this.proxyLevel = PaperweightLevelProxy.getInstance(serverLevel, this);
-        this.mutableBlockPlaceContext = new FaweMutableBlockPlaceContext(proxyLevel);
+        this.mutableBlockPlaceContext = new PaperweightFaweMutableBlockPlaceContext(proxyLevel);
     }
 
     @Override

worldedit-core/src/main/java/com/fastasyncworldedit/core/extent/processor/PlacementStateProcessor.java

@@ -1,5 +1,7 @@
 package com.fastasyncworldedit.core.extent.processor;
 
+import com.fastasyncworldedit.core.configuration.Caption;
+import com.fastasyncworldedit.core.extent.NullExtent;
 import com.fastasyncworldedit.core.extent.filter.block.FilterBlock;
 import com.fastasyncworldedit.core.function.mask.AdjacentAny2DMask;
 import com.fastasyncworldedit.core.math.BlockVector3ChunkMap;
@@ -9,11 +11,12 @@ import com.fastasyncworldedit.core.queue.IBatchProcessor;
 import com.fastasyncworldedit.core.queue.IChunk;
 import com.fastasyncworldedit.core.queue.IChunkGet;
 import com.fastasyncworldedit.core.queue.IChunkSet;
+import com.fastasyncworldedit.core.registry.state.PropertyKey;
 import com.sk89q.jnbt.CompoundTag;
 import com.sk89q.worldedit.WorldEditException;
 import com.sk89q.worldedit.extent.AbstractDelegateExtent;
 import com.sk89q.worldedit.extent.Extent;
-import com.sk89q.worldedit.extent.NullExtent;
+import com.sk89q.worldedit.function.mask.BlockCategoryMask;
 import com.sk89q.worldedit.function.mask.BlockTypeMask;
 import com.sk89q.worldedit.function.pattern.Pattern;
 import com.sk89q.worldedit.math.BlockVector3;
@@ -48,6 +51,7 @@ public abstract class PlacementStateProcessor extends AbstractDelegateExtent imp
 
     private static volatile boolean SETUP = false;
     private static BlockTypeMask DEFAULT_MASK = null;
+    private static BlockTypeMask IN_FIRST_PASS = null;
     private static BlockTypeMask REQUIRES_SECOND_PASS = null;
     private static AdjacentAny2DMask ADJACENT_STAIR_MASK = null;
 
@@ -59,6 +63,7 @@ public abstract class PlacementStateProcessor extends AbstractDelegateExtent imp
     protected final AtomicBoolean finished;
     private final MutableVector3 clickPos = new MutableVector3();
     private final MutableBlockVector3 clickedBlock = new MutableBlockVector3();
+    private final MutableBlockVector3 placedBlock = new MutableBlockVector3(Integer.MAX_VALUE, Integer.MAX_VALUE, Integer.MAX_VALUE);
 
     private IChunkGet processChunkGet = null;
     private IChunkSet processChunkSet = null;
@@ -109,7 +114,19 @@ public abstract class PlacementStateProcessor extends AbstractDelegateExtent imp
     }
 
     private static void setup() {
-        REQUIRES_SECOND_PASS = new BlockTypeMask(new NullExtent());
+        NullExtent nullExtent = new NullExtent(
+                com.sk89q.worldedit.extent.NullExtent.INSTANCE,
+                Caption.of("PlacementStateProcessor fell through to null extent")
+        );
+
+        IN_FIRST_PASS = new BlockTypeMask(nullExtent);
+        IN_FIRST_PASS.add(
+                BlockTypes.CHEST,
+                BlockTypes.TRAPPED_CHEST
+        );
+        IN_FIRST_PASS.add(BlockCategories.STAIRS.getAll());
+
+        REQUIRES_SECOND_PASS = new BlockTypeMask(nullExtent);
         REQUIRES_SECOND_PASS.add(
                 BlockTypes.IRON_BARS,
                 BlockTypes.GLASS_PANE,
@@ -164,8 +181,8 @@ public abstract class PlacementStateProcessor extends AbstractDelegateExtent imp
                 DEFAULT_MASK.add(category.getAll());
             }
         }
-        BlockTypeMask stairs = new BlockTypeMask(new NullExtent(), BlockCategories.STAIRS.getAll());
+
-        ADJACENT_STAIR_MASK = new AdjacentAny2DMask(stairs, false);
+        ADJACENT_STAIR_MASK = new AdjacentAny2DMask(new BlockCategoryMask(nullExtent, BlockCategories.STAIRS), false);
         SETUP = true;
     }
 
@@ -225,13 +242,14 @@ public abstract class PlacementStateProcessor extends AbstractDelegateExtent imp
                 int blockX = processChunkX + x;
                 char ordinal = set[index];
                 BlockState state = BlockTypesCache.states[ordinal];
-                if (firstPass && !BlockCategories.STAIRS.contains(state)) {
+                if (firstPass && !IN_FIRST_PASS.test(state)) {
                     continue;
                 }
                 if (!mask.test(state)) {
                     continue;
                 }
-                if (!firstPass && REQUIRES_SECOND_PASS.test(state)) {
+                boolean atEdge = x == 0 || x == 15 || z == 0 || z == 15;
+                if (!firstPass && atEdge && REQUIRES_SECOND_PASS.test(state)) {
                     postCompleteSecondPasses.put(new SecondPass(
                             blockX,
                             blockY,
@@ -241,6 +259,11 @@ public abstract class PlacementStateProcessor extends AbstractDelegateExtent imp
                     set[index] = BlockTypesCache.ReservedIDs.__RESERVED__;
                     continue;
                 }
+                if (state.getBlockType().equals(BlockTypes.CHEST) || state.getBlockType().equals(BlockTypes.TRAPPED_CHEST)) {
+                    placedBlock.setComponents(blockX, blockY, blockZ);
+                } else {
+                    placedBlock.setComponents(Integer.MAX_VALUE, Integer.MAX_VALUE, Integer.MAX_VALUE);
+                }
                 char newOrdinal = getBlockOrdinal(blockX, blockY, blockZ, state);
                 if (newOrdinal == ordinal) {
                     continue;
@@ -313,6 +336,28 @@ public abstract class PlacementStateProcessor extends AbstractDelegateExtent imp
         if (ordinal == BlockTypesCache.ReservedIDs.__RESERVED__) {
             return processChunkGet.getBlock(x & 15, y, z & 15);
         }
+        BlockState state = BlockTypesCache.states[ordinal];
+        // "Hack" for stairs as internal server methods will only accept "single" chests for joining
+        if (state.getBlockType().equals(BlockTypes.CHEST) || state.getBlockType().equals(BlockTypes.TRAPPED_CHEST)) {
+            String shape =  state.getState(PropertyKey.TYPE).toString();
+            if (shape.equals("right")) {
+                Direction facing = state.getState(PropertyKey.FACING);
+                Direction left = facing.getLeft();
+                int testX = x + left.getBlockX();
+                int testZ = z + left.getBlockZ();
+                if (placedBlock.isAt(testX, y, testZ)) {
+                    return state.with(PropertyKey.TYPE, "single");
+                }
+            } else if(shape.equals("left")) {
+                Direction facing = state.getState(PropertyKey.FACING);
+                Direction right = facing.getRight();
+                int testX = x + right.getBlockX();
+                int testZ = z + right.getBlockZ();
+                if (placedBlock.isAt(testX, y, testZ)) {
+                    return state.with(PropertyKey.TYPE, "single");
+                }
+            }
+        }
         return BlockTypesCache.states[ordinal];
     }
 

worldedit-core/src/main/java/com/sk89q/worldedit/function/mask/BlockCategoryMask.java

@@ -22,6 +22,7 @@ package com.sk89q.worldedit.function.mask;
 import com.sk89q.worldedit.extent.Extent;
 import com.sk89q.worldedit.math.BlockVector3;
 import com.sk89q.worldedit.world.block.BlockCategory;
+import com.sk89q.worldedit.world.block.BlockStateHolder;
 import com.sk89q.worldedit.world.block.BlockTypes;
 
 import javax.annotation.Nullable;
@@ -54,6 +55,15 @@ public class BlockCategoryMask extends AbstractExtentMask {
     public boolean test(Extent extent, BlockVector3 vector) {
         return category.contains(extent.getBlock(vector));
     }
+
+    /**
+     * Test a specific block against this category mask
+     *
+     * @since TODO
+     */
+    public <B extends BlockStateHolder<B>> boolean test(B blockStateHolder) {
+        return category.contains(blockStateHolder);
+    }
     //FAWE end
 
     @Nullable

worldedit-core/src/main/java/com/sk89q/worldedit/math/BlockVector3.java

@@ -127,6 +127,10 @@ public abstract class BlockVector3 {
     }
 
     //FAWE start
+    public boolean isAt(int x, int y, int z) {
+        return x() == x && y() == y && z() == z;
+    }
+
     public MutableBlockVector3 setComponents(double x, double y, double z) {
         return new MutableBlockVector3((int) x, (int) y, (int) z);
     }

worldedit-core/src/main/java/com/sk89q/worldedit/util/SideEffectSet.java

@@ -19,7 +19,6 @@
 
 package com.sk89q.worldedit.util;
 
-import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.Maps;
 
 import java.util.Arrays;
@@ -31,7 +30,12 @@ import java.util.stream.Collectors;
 
 public class SideEffectSet {
 
-    private static final SideEffectSet DEFAULT = new SideEffectSet();
+    //FAWE start - assign value map
+    private static final SideEffectSet DEFAULT = new SideEffectSet(
+            Arrays.stream(SideEffect.values())
+                    .filter(SideEffect::isExposed)
+                    .collect(Collectors.toMap(Function.identity(), SideEffect::getDefaultValue)));
+    //FAWE end
     private static final SideEffectSet NONE = new SideEffectSet(
         Arrays.stream(SideEffect.values())
             .filter(SideEffect::isExposed)
@@ -42,12 +46,6 @@ public class SideEffectSet {
     private final Set<SideEffect> appliedSideEffects;
     private final boolean appliesAny;
 
-    //FAWE start
-    private SideEffectSet() {
-        this(ImmutableMap.of());
-    }
-    //FAWE end
-
     public SideEffectSet(Map<SideEffect, SideEffect.State> sideEffects) {
         this.sideEffects = Maps.immutableEnumMap(sideEffects);