Rendering issues since 5.41.2

[cnolte]

Describe the bug

Version 5.41.2 of Svelte introduced multiple rendering issues in my App. The app uses async svelte. It was pretty time consuming to create a reproduction and I hope it's ok the way I did. The app works as expected with Svelte 5.41.1

Reproduction

https://github.com/cnolte/render-issue

Run the app then click on Pricing and then on Partnerships. The menu button for Partnerships won't be selected. When you refresh the page or you first click on Partnerships you'll see that it is selected.

Logs

System Info

See provided App

Severity

blocking an upgrade

[paoloricciuti]

Screen.Recording.2025-10-26.at.18.46.27.mov

I can't reproduce this...can you check to see if it was already fixed or to provide an actual reproduction? Thanks for reporting!

[cnolte]

@paoloricciuti In your Video I can see the Bug. The Partnership Button on the left should be selected. The Text Shows selected but the State isn‘t provided to the component. You can see the difference when you refresh the Page. Then the Button is selected.

[paoloricciuti]

Oh sorry, I was looking at the "menu" Partnerships label

[whalderman]

Not sure if it's the same cause, but, in my case, Svelte no longer injects the mounted component's style tag(s) after upgrading from 5.41.1 to 5.41.2. Though, the same style tag is injected if the component is mounted to a Shadow DOM in some contexts for some reason.

However, I haven't been able to isolate the cause in the REPL yet.