src/pages/VisProgPage/visualProgrammingUI/VisProgStores.tsx

@@ -90,9 +90,20 @@ const useFlowStore = create<FlowState>(UndoRedo((set, get) => ({
    */
   onNodesChange: (changes) => set({nodes: applyNodeChanges(changes, get().nodes)}),
 
-  onNodesDelete: (nodes) => nodes.forEach((_node) => {
+  onNodesDelete: (deletedNodes) => {
-    return;
+
-  }),
+    const allNodes = get().nodes;
+    const deletedIds = new Set(deletedNodes.map(n => n.id));
+
+    deletedNodes.forEach((node) => {
+      get().unregisterNodeRules(node.id);
+      get().unregisterWarningsForId(node.id);
+    });
+    const remainingNodes = allNodes.filter((node) => !deletedIds.has(node.id));
+    
+    // Validate only the survivors
+    get().validateDuplicateNames(remainingNodes);
+  },
 
   onEdgesDelete: (edges) => {
     // we make sure any affected nodes get updated to reflect removal of edges