fix: don't lock for chunk packets/section write on main thread (#3059)

Author: dordsor21

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

@@ -2,6 +2,7 @@
 
 import com.fastasyncworldedit.bukkit.FaweBukkitWorld;
 import com.fastasyncworldedit.core.FAWEPlatformAdapterImpl;
+import com.fastasyncworldedit.core.Fawe;
 import com.fastasyncworldedit.core.math.IntPair;
 import com.fastasyncworldedit.core.queue.IChunkGet;
 import com.fastasyncworldedit.core.util.MathMan;
@@ -124,6 +125,9 @@ protected static <LevelChunkSection> boolean setSectionAtomic(
         if (layer < 0 || layer >= sections.length) {
             return false;
         }
+        if (Fawe.isMainThread()) {
+            return ReflectionUtils.compareAndSet(sections, expected, value, layer);
+        }
         StampLockHolder holder = new StampLockHolder();
         ConcurrentHashMap<IntPair, ChunkSendLock> chunks = FaweBukkitWorld.getWorldSendingChunksMap(worldName);
         chunks.compute(pair, (k, lock) -> {