fix(teleport): avoid infinite recursion in process when teleport is deferred

Author: edison1105

packages/runtime-core/src/components/Teleport.ts

@@ -164,6 +164,7 @@ export const TeleportImpl = {
       }
 
       if (isTeleportDeferred(n2.props)) {
+        n2.el!.__isMounted = false
         queuePostRenderEffect(() => {
           mountToTarget()
           n2.el!.__isMounted = true
@@ -172,7 +173,7 @@ export const TeleportImpl = {
         mountToTarget()
       }
     } else {
-      if (isTeleportDeferred(n2.props) && !n1.el!.__isMounted) {
+      if (isTeleportDeferred(n2.props) && n1.el!.__isMounted === false) {
         queuePostRenderEffect(() => {
           TeleportImpl.process(
             n1,