fix: correctly processSet with blacklist when required (#2270)

* fix: correctly processSet with blacklist when required

* Fix incorrect region

worldedit-core/src/main/java/com/fastasyncworldedit/core/extent/MultiRegionExtent.java

@@ -172,7 +172,7 @@ public class MultiRegionExtent extends FaweRegionExtent {
             set = intersection.processSet(chunk, get, set);
         }
         if (disallowedIntersection != null) {
-            intersection.processSet(chunk, get, set);
+            set = disallowedIntersection.processSet(chunk, get, set, true);
         }
         return set;
     }