fallback to sync hypervisor

Author: brachy84

src/main/java/com/cleanroommc/modularui/widget/Widget.java

@@ -144,13 +144,16 @@ public void afterInit() {}
 
     /**
      * Retrieves, verifies, and initialises a linked sync handler.
-     * Custom logic should be handled in {@link #isValidSyncHandler(SyncHandler)}.
+     * Custom logic should be handled in {@link #setSyncOrValue(ISyncOrValue)}.
      */
     @Override
     public void initialiseSyncHandler(ModularSyncManager syncManager, boolean late) {
         SyncHandler handler = this.syncHandler;
         if (handler == null && this.syncKey != null) {
             handler = syncManager.getSyncHandler(getPanel().getName(), this.syncKey);
+            if (handler == null && !syncManager.getMainPSM().getPanelName().equals(getPanel().getName())) {
+                handler = syncManager.getMainPSM().getSyncHandlerFromMapKey(this.syncKey);
+            }
         }
         if (handler != null) setSyncOrValue(handler);
         if (this.syncHandler instanceof ValueSyncHandler<?> valueSyncHandler && valueSyncHandler.getChangeListener() == null) {