Fixed the Forge platform not exposing events, and added a comment about PoI

worldedit-core/src/main/java/com/sk89q/worldedit/internal/wna/WorldNativeAccess.java

@@ -182,6 +182,7 @@ default void markAndNotifyBlock(NP pos, NC chunk, NBS oldState, NBS newState, Si
             updateNeighbors(pos, oldState, newState, 512);
         }
 
+        // Seems used only for PoI updates
         onBlockStateChange(pos, oldState, newState);
     }
 

worldedit-forge/src/main/java/com/sk89q/worldedit/forge/ForgePlatform.java

@@ -216,7 +216,8 @@ public Map<Capability, Preference> getCapabilities() {
             SideEffect.VALIDATION,
             SideEffect.ENTITY_AI,
             SideEffect.LIGHTING,
-            SideEffect.NEIGHBORS
+            SideEffect.NEIGHBORS,
+            SideEffect.EVENTS
     );
 
     @Override