Transition are not ignoring html comments

[AlexandreBonaventure]

Version

3.0.0-beta.14

Reproduction link

https://jsfiddle.net/bfag54kh/

Steps to reproduce

Put an HTML comment among Transition's children

What is expected?

It should ignore HTML comment and act as the comment is not here

What is actually happening?

It is throwing a warning
"[Vue warn]: Template compilation error: Transition expects exactly one child element or component.

---

If you remove the comment from the repro it is going to remove the warning

[underfin]

Look like it is intentional. I fixed other warn for invalid expression with v-else on beta.15.

[SilentDepth]

Seems like this problem still exists in Vue 3.0.5 when using bundler.

Repro: https://codesandbox.io/s/vue-3-transition-comment-issue-chjvl