Slots render issure

[l-x-f]

Vue version

3.4.23

Link to minimal reproduction

https://github.com/l-x-f/vue-slots-render-issure

Steps to reproduce

components/Children0.vue

<template>
  <div>
    <slot name="default">
      <component v-if="$slots.default" :is="$slots.default" />
      <template v-else> default-value</template>
    </slot>
  </div>
</template>

components/Children1.vue

<template>
  <div>
    <slot name="default"> default-value</slot>
  </div>
</template>

App.vue

<template>
  <h3>examples1</h3>
  <Children0>
    <template v-if="false">100</template>
  </Children0>
  <br />

  <h3>examples2</h3>
  <Children0>
    <template v-if="false" #default>100</template>
  </Children0>
  <br />

  <h3>examples3</h3>
  <Children1>
    <template v-if="false">100</template>
  </Children1>
</template>

<script setup>
import Children0 from './components/Children0.vue'
import Children1 from './components/Children1.vue'
</script>

What is expected?

I expected Examples1 to render 'default-value', but there was no rendering.

What is actually happening?

I expected Examples1 to render 'default-value', but there was no rendering.

System Info

System:
    OS: Windows 10 10.0.22000
    CPU: (12) x64 Intel(R) Core(TM) i5-10400 CPU @ 2.90GHz
    Memory: 3.98 GB / 15.75 GB
  Binaries:
    Node: 16.18.0 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.22.21 - C:\Program Files\nodejs\yarn.CMD
    npm: 8.19.2 - C:\Program Files\nodejs\npm.CMD
    pnpm: 8.15.0 - C:\Program Files\nodejs\pnpm.CMD
  Browsers:
    Edge: Spartan (44.22000.120.0), Chromium (123.0.2420.97)
    Internet Explorer: 11.0.22000.120
  npmPackages:
    vue: ^3.4.23 => 3.4.23

Any additional comments?

No response

[Doctor-wu]

reproduce in playground

[edison1105]

The fix may be a breaking change.

• If after the fix the effect of examples1 is consistent with examples2, it may cause the slot fallback content that should not be displayed on the user side to be displayed.
• If after the fix the effect of examples2 is consistent with examples1, it may cause the slot fallback content that should be displayed on the user side to not be displayed.