Slots behave differently from Vue 3.5.14, breaks code that worked in 3.5.13

[uandco]

Vue version

3.5.14+

Link to minimal reproduction

https://github.com/uandco/vuejs-314-slots-bug

Steps to reproduce

Run npm install
Run vite

Go to http://localhost:8080

Page displays OK

Change "vue": "3.5.13" to "vue": "3.5.14" or later
Run npm install
Run vite

Go to http://localhost:8080

Page doesn't display, throws:

uuFaq.vue:5 Uncaught TypeError: item is not a function
    at uuFaq.vue:5:36
    at Proxy._sfc_render (uuFaq.vue:1:1)

What is expected?

Iterating slots and extracting props from them should work as it did in Vue 3.5.13 and below

What is actually happening?

It doesn't work when loading the page, getting this:

TypeError: item is not a function
    at uuFaq.vue:5:36
    at renderList (runtime-core.esm-bundler.js:2935:18)
    at Proxy._sfc_render (uuFaq.vue:1:1)

But changing something in the App.vue and letting Vite hot-reload it makes it work.

It never works for built assets though.

System Info

Any additional comments?

It might be related to 5d166f3

[skirtles-code]

I tried to reproduce this in the Playground, but it seems to need whitespace: 'preserve', which isn't available in the main Playground. I added whitespace: 'preserve' to a local copy of the Playground and was able to observe the same problem described here.

[uandco]

I tried to reproduce this in the Playground, but it seems to need whitespace: 'preserve', which isn't available in the main Playground. I added whitespace: 'preserve' to a local copy of the Playground and was able to observe the same problem described here.

Ah, that's a very good catch, I tried to reproduce in the playground too but couldn't, and didnt make the link with whitespace: 'preserve'. It is indeed what is triggering the bug!

[edison1105]

Here is a minimal reproduction

• Playground