fix: occasional "SENDING_CHUNKS stored lock does not equal lock attempted to be unlocked" (#3199)

Author: lmMaxxx

worldedit-bukkit/src/main/java/com/fastasyncworldedit/bukkit/adapter/NMSAdapter.java

@@ -181,7 +181,7 @@ protected static void beginChunkPacketSend(String worldName, IntPair pair, Stamp
                 lock = new ChunkSendLock();
             }
             // Allow twice-read-locking, so if the packets have been created but not sent, we can queue another read
-            if (lock.writeWaiting || lock.lock.getReadLockCount() > 1 || lock.lock.isWriteLocked()) {
+            if (lock.writeWaiting || lock.lock.getReadLockCount() >= 1 || lock.lock.isWriteLocked()) {
                 return lock;
             }
             stampedLock.stamp = lock.lock.readLock();