New slot syntax doesn't work the same way as old syntax

[MKhasib]

Vue version

3

Link to minimal reproduction

vuejs/vue#12232

Steps to reproduce

Issue started with vue2.6 and continued to vue3

What is expected?

it should run updated lifecycle hook whenever parent of the slot component is updated

What is actually happening?

it doesn't run updated lifecycle of the slot unless you use a v-model on the input slot

System Info

No response

Any additional comments?

No response

[LinusBorg]

This is expected. Slots in Vue 3 now always behave like scoped slots in Vue 2 - meaning the child will only update when the slot content changed.

You can check out the Migration guide for details