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

@@ -443,12 +443,17 @@ public class PaperweightGetBlocks extends CharGetBlocks implements BukkitGetBloc
         if (chunk != null) {
             return internalCall(set, finalizer, chunk, nmsWorld);
         }
+        // Submit via the STQE as that will help handle excessive queuing by waiting for the submission count to fall below the
+        // target size
         nmsChunkFuture.thenApply(nmsChunk -> owner.submitTaskUnchecked(() -> (T) internalCall(
                 set,
                 finalizer,
                 nmsChunk,
                 nmsWorld
         )));
+        // If we have re-submitted, return a completed future to prevent potential deadlocks where a future reliant on the
+        // above submission is halting the BlockingExecutor, and preventing the above task from actually running. The futures
+        // submitted above will still be added to the STQE submissions.
         return (T) (Future) CompletableFuture.completedFuture(null);
     }