I'm not entirely sure, but this looks like a bug to me, because this only happens with the slot content.
In the mean time, key-ing the element in question helps: https://jsfiddle.net/a8kverza/3/

I just ran into something similar. Although in my example, a v-if on a nested slot causes a sibling component to be recreated: https://jsfiddle.net/y0vgrwjy/1/

Probably related?

@nerdcave , I think it is related. the reason is what I describe in PR.

you will find it works well if you change slot content position like this

@pengchongfu, Also works if you add a key to <my-data>. Thanks for looking into it.

@nerdcave ,you can also add a wrapper like this, the wrapper would be a placeholder so that the default key of input will not changed.