fix(runtime-core): ensure custom directive instance properly exposes properties on closed instances. (#5022)

fix #5018

packages/runtime-core/src/directives.ts

@@ -14,7 +14,7 @@ return withDirectives(h(comp), [
 import { VNode } from './vnode'
 import { isFunction, EMPTY_OBJ, isBuiltInDirective } from '@vue/shared'
 import { warn } from './warning'
-import { ComponentInternalInstance, Data } from './component'
+import { ComponentInternalInstance, Data, getExposeProxy } from './component'
 import { currentRenderingInstance } from './componentRenderContext'
 import { callWithAsyncErrorHandling, ErrorCodes } from './errorHandling'
 import { ComponentPublicInstance } from './componentPublicInstance'
@@ -89,7 +89,9 @@ export function withDirectives<T extends VNode>(
     __DEV__ && warn(`withDirectives can only be used inside render functions.`)
     return vnode
   }
-  const instance = internalInstance.proxy
+  const instance =
+    (getExposeProxy(internalInstance) as ComponentPublicInstance) ||
+    internalInstance.proxy
   const bindings: DirectiveBinding[] = vnode.dirs || (vnode.dirs = [])
   for (let i = 0; i < directives.length; i++) {
     let [dir, value, arg, modifiers = EMPTY_OBJ] = directives[i]