First v-if inside a named template causes sibling elements to only render when it itself is rendered

[SarthakSingh31]

Version

2.6.13

Reproduction link

https://codesandbox.io/s/relaxed-sun-291he?file=/src/App.vue

Steps to reproduce

1. Create a template with a named slot inside it.
2. Use this template inside a component.
3. Put a <div v-if="false"></div> as the first element inside the template for the named slot.
4. Add a sibling element after the <div v-if="false"></div>.

What is expected?

The sibling element is rendered irrespective of the <div v-if="false"></div> being rendered

What is actually happening?

The sibling element only renders when <div v-if="false"></div> renders i.e. when I set v-if="true"

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This is my first time using codesandbox.io so I also created a git repo with the mcve incase the codesandbox.io link does not work.
https://github.com/SarthakSingh31/vue-mcve

[logaretm]

Same issue with v-slot syntax for default scoped slots

https://codesandbox.io/s/red-https-vfqxw?file=/src/App.vue

[posva]

Please search existing issues before opening one. Already fixed

[SarthakSingh31]

I think it will help if #12102 is labeled as a bug as that is the label I searched under when I was looking for an existing issue.