Add for 1.21

worldedit-bukkit/adapters/adapter-1_21/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_21_R1/PaperweightLevelProxy.java

@@ -20,8 +20,8 @@ import javax.annotation.Nullable;
 public class PaperweightLevelProxy extends ServerLevel {
 
     protected ServerLevel serverLevel;
-    private PaperweightFaweAdapter adapter;
     private PaperweightPlacementStateProcessor processor;
+    private PaperweightFaweAdapter adapter;
 
     @SuppressWarnings("DataFlowIssue")
     private PaperweightLevelProxy() {

worldedit-bukkit/adapters/adapter-1_21/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/fawe/v1_21_R1/PaperweightPlacementStateProcessor.java

@@ -82,8 +82,8 @@ public class PaperweightPlacementStateProcessor extends PlacementStateProcessor
                 new BlockHitResult(pos, side, blockPos, false),
                 side.getOpposite()
         ));
-        return newState == null ? BlockTypesCache.ReservedIDs.AIR :
+        return newState == null ? BlockTypesCache.ReservedIDs.AIR : adapter.ibdIDToOrdinal(Block.BLOCK_STATE_REGISTRY.getId(
-                adapter.ibdIDToOrdinal(Block.BLOCK_STATE_REGISTRY.getId(newState));
+                newState));
     }
 
     @Override