Restrict applyToGraph to PrimitiveNode (#2669)

src/utils/executionUtil.ts

@@ -1,6 +1,7 @@
 import type { LGraph } from '@comfyorg/litegraph'
 import { LGraphEventMode } from '@comfyorg/litegraph'
 
+import { isPrimitiveNode } from '@/nodes/PrimitiveNode'
 import type { ComfyApiWorkflow, ComfyWorkflowJSON } from '@/types/comfyWorkflow'
 
 /**
@@ -19,11 +20,8 @@ export const graphToPrompt = async (
       ? outerNode.getInnerNodes()
       : [outerNode]
     for (const node of innerNodes) {
-      if (node.isVirtualNode) {
-        // Don't serialize frontend only nodes but let them make changes
-        if (node.applyToGraph) {
-          node.applyToGraph()
-        }
+      if (isPrimitiveNode(node)) {
+        node.applyToGraph()
       }
     }
   }