Regarding #393

- Fix CharFilterBlock not being properly created (the chunk X and Z were never set)
 - Replace BlockVector3#divide with bitshift because you can't divide down and then bitshift back up with the correct results for negative values

worldedit-core/src/main/java/com/boydti/fawe/beta/IQueueExtent.java

@@ -148,7 +148,7 @@ public interface IQueueExtent<T extends IChunk> extends Flushable, Trimable, ICh
         if (newChunk != null) {
             chunk = newChunk;
             if (block == null) {
-                block = this.initFilterBlock();
+                block = this.initFilterBlock().initChunk(chunkX, chunkZ);
             }
             chunk.filterBlocks(filter, block, region, full);
         }

worldedit-core/src/main/java/com/sk89q/worldedit/regions/AbstractRegion.java

@@ -169,8 +169,11 @@ public abstract class AbstractRegion extends AbstractSet<BlockVector3> implement
     public Set<BlockVector2> getChunks() {
         final Set<BlockVector2> chunks = new HashSet<>();
 
-        final BlockVector3 min = getMinimumPoint().divide(16);
-        final BlockVector3 max = getMaximumPoint().divide(16);
+        final BlockVector3 minBlock = getMinimumPoint();
+        final BlockVector3 maxBlock = getMaximumPoint();
+
+        final BlockVector2 min = BlockVector2.at(minBlock.getX() >> 4, minBlock.getZ() >> 4);
+        final BlockVector2 max = BlockVector2.at(maxBlock.getX() >> 4, maxBlock.getZ() >> 4);
 
         for (int X = min.getBlockX(); X <= max.getBlockX(); ++X) {
             for (int Z = min.getBlockZ(); Z <= max.getBlockZ(); ++Z) {