svelte:element buggy behaviour with class:foo

[AlbertMarashi]

Describe the bug

Svelte is having buggy behavior with the new svelte:element. The advanced classes (class:foo) do not properly work with props for some reason. I haven't narrowed down why, but I have created a REPL below.

Reproduction

https://svelte.dev/repl/c74f48f8e55445c9b02734145bf78391?version=3.48.0

Workarounds

not using class:foo, and switching to class="{foo ? 'foo' : ''}" (at the cost of missing unused classes)

System Info

N/A

Severity

annoyance

[baseballyama]

This is compiler bug and this is because of this PR.
#7486

Already I fixed it up in my local but I would like to check for a similar issue is there or not.

[AlbertMarashi]

#7478 Duplicate issue and solved by #7486

[baseballyama]

Oh Please reopen this.🙏

I mean #7486 introduced this bug and I will create new PR.

[AlbertMarashi]

Oh Please reopen this.🙏

I mean #7486 introduced this bug and I will create new PR.

My bad sorry

[bfanger]

Reproduction of this bug in the context of a SvelteKit app: https://stackblitz.com/edit/sveltekit-ef9nqu?file=src/routes/[bug].svelte

[doceazedo]

If this is of any use, this bug also happens when the slot of the component is updated. The class disappears, although the value is correct: https://svelte.dev/repl/88605f45add6421da45265233c235edf?version=3.48.0