Version

3.2.20

Reproduction link

sfc.vuejs.org/

Steps to reproduce

1. open Devtool
2. click button

What is expected?

Comp should not be re-rendered

What is actually happening?

Comp will be remounted

1. You change the content of key
2. that makes the computed update
3. The computed returns a new component
4. That new component is mounted after the old one has been unmounted.

This is expected behaviour.