Fixed //replace and masks with states.

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

@@ -95,7 +95,13 @@ public class BlockMask extends AbstractExtentMask {
     @Override
     public boolean test(Vector vector) {
         BlockStateHolder block = getExtent().getBlock(vector);
-        return blocks.contains(block) || blocks.contains(block);
+        for (BlockStateHolder testBlock : blocks) {
+            if (testBlock.equalsFuzzy(block)) {
+                return true;
+            }
+        }
+
+        return false;
     }
 
     @Nullable

worldedit-core/src/main/java/com/sk89q/worldedit/registry/state/AbstractProperty.java

@@ -53,4 +53,17 @@ public abstract class AbstractProperty<T> implements Property<T> {
         checkState(this.name == null, "name already set");
         this.name = name;
     }
+
+    @Override
+    public int hashCode() {
+        return name.hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (!(obj instanceof Property)) {
+            return false;
+        }
+        return getName().equals(((Property) obj).getName());
+    }
 }

worldedit-core/src/main/java/com/sk89q/worldedit/world/block/BlockState.java

@@ -31,9 +31,12 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
 import java.util.stream.Collectors;
 
 /**
@@ -167,7 +170,7 @@ public class BlockState implements BlockStateHolder<BlockState> {
             return false;
         }
 
-        List<Property> differingProperties = new ArrayList<>();
+        Set<Property> differingProperties = new HashSet<>();
         for (Object state : o.getStates().keySet()) {
             if (getState((Property) state) == null) {
                 differingProperties.add((Property) state);
@@ -179,8 +182,11 @@ public class BlockState implements BlockStateHolder<BlockState> {
             }
         }
 
-        for (Property property : differingProperties) {
-            if (!getState(property).equals(o.getState(property))) {
+        for (Property property : getStates().keySet()) {
+            if (differingProperties.contains(property)) {
+                continue;
+            }
+            if (!Objects.equals(getState(property), o.getState(property))) {
                 return false;
             }
         }