Experimental async: issue when hovering a link that has +layout.svelte #17197
Description
Describe the bug
Since svelte 5.42.0, there is a weird reactivity bug in a very specific situation.
Using bits-ui (for example a tooltip), and experimental async, when hovering/preloading a link that points to a page with +layout.svelte, the tooltip freezes. And any other tooltip will not work anymore.
Reproduction
I made a sveltekit project on SvelteLab with everything needed to reproduce the problem: https://www.sveltelab.dev/q30g562x4ns934i
Hope it helps.
Logs
System Info
On macos, sveltelab....Severity
blocking an upgrade