fix(v-once): fix v-once usage with v-if and v-for

fix #2035

packages/compiler-core/src/transform.ts

@@ -399,6 +399,7 @@ export function traverseNode(
   }
 
   // exit transforms
+  context.currentNode = node
   let i = exitFns.length
   while (i--) {
     exitFns[i]()

packages/compiler-core/src/transforms/vOnce.ts

@@ -1,14 +1,21 @@
 import { NodeTransform } from '../transform'
 import { findDir } from '../utils'
-import { NodeTypes } from '../ast'
+import { ElementNode, ForNode, IfNode, NodeTypes } from '../ast'
 import { SET_BLOCK_TRACKING } from '../runtimeHelpers'
 
+const seen = new WeakSet()
+
 export const transformOnce: NodeTransform = (node, context) => {
   if (node.type === NodeTypes.ELEMENT && findDir(node, 'once', true)) {
+    if (seen.has(node)) {
+      return
+    }
+    seen.add(node)
     context.helper(SET_BLOCK_TRACKING)
     return () => {
-      if (node.codegenNode) {
-        node.codegenNode = context.cache(node.codegenNode, true /* isVNode */)
+      const cur = context.currentNode as ElementNode | IfNode | ForNode
+      if (cur.codegenNode) {
+        cur.codegenNode = context.cache(cur.codegenNode, true /* isVNode */)
       }
     }
   }