Vue version

3.2.38

Link to minimal reproduction

SFC Playground

Steps to reproduce

1. Open the demo@vue3.2.38
2. After clicking it, two nodes will appear

What is expected?

1. open the demo@vue3.2.37
2. After clicking it, one node will appear

What is actually happening?

Two nodes will appear!!!

System Info

No response

Any additional comments?

No response

@LinusBorg Both Vant's Toast component and Arco-Design's Message component are implemented using Vue.render. Here is the core code. demo

Duplicate of #6609

I'll keep this issue open and keep #6609 closed because this issue here as a minimal reproduction out of the gate and focusses on the actual issue.

related to https://github.com/vuejs/core/blob/78c199d6dbe8931520b75d8bfe0d49366a06922a/packages/runtime-core/src/renderer.ts#L2333-L2334

@yyx990803 I can still reproduce the issue on a deployed app (Vue 3.2.39 in production mode) but it's very difficult to create a reproduction as it seems to be random. I guess there is a timing or race condition at play...

Here is a screenshot of requests failing becase watchers are being executed while unmounting components after changing route:

I will continue to investigate and try to narrow the issue down.