Migration from 2 to 3: child component updating

[helenezspeer]

I am working on a migration of a pretty complex app, and have noticed some inconsistencies between Vue2 and Vue3. I'm hoping someone can help explain them.

For instance, in Vue2, a data change would trigger a v-if to unmount a child component. In Vue3, the same data change results in the child's updating before the parent unmounts it.

Is there a particular behavior change between Vue2 and 3 that would help me understand what I need to look for in my migration?

[LinusBorg]

I'm not aware of such a behavior in Vue 3, so I'd have to ask you to get more specific and provide an example that I can check out.