bits-ui Popover doesn't open

[dylan1951]

Describe the bug

The Popover from bits-ui is not opening under certain weird conditions.

Reproduction

REPL

<script>
    import { Popover } from "bits-ui";

    let open = $state(false);

    let foo = $derived(await open);
</script>

<Popover.Root bind:open>
    <Popover.Trigger>Open Popover</Popover.Trigger>
    <Popover.Content>
        Content
    </Popover.Content>
</Popover.Root>

{#if open}
    <p>The popover should be open but it's not :(</p>
{/if}

Logs

System Info

svelte playground

Severity

blocking an upgrade

[7nik]

  --bits-floating-transform-origin: undefined undefined;
  --bits-floating-available-width: undefinedpx;
  --bits-floating-available-height: undefinedpx;
  --bits-floating-anchor-width: undefinedpx;
  --bits-floating-anchor-height: undefinedpx;

I guess bits-ui miscalculates something or uses outdated references.

[dylan1951]

It works when you navigate back to the page though, but not after refreshing the page which makes me think it's a svelte bug but idk

[7nik]

The popover's logic is spread across dozens of files + floating-ui repo. It's too complex for us to unwrap the logic.
Open an issue in bits-ui. If it's Svelte's bug, the authors will come here with a simpler reproduction.

[jjones315]

Duplicate of #17049

[dylan1951]

huntabyte/bits-ui#1882

I fixed it by adding this dependency to the $effect but my feeling is that there is a deeper svelte bug here related to the effect dependency chain. Sorry I don't know how to make a minimal repro :(

[vyconm]

fixed by #17105 in Svelte 5.43.34

[sillvva]

fixed by #17105 in Svelte 5.43.34

No it's not. This is OP's REPL on 5.43.4. It's still broken.

[7nik]

@vyconm I don't see difference - Content still doesn't appear.