Combobox: keyboard nav when items aren't immediately mounted

[MilosNikolic]

Describe the bug

When I try to implement debounce to Combobox, the arrow navigation to select an item doesn't work.
In the minimal reproduction i use Runed, but i tried in other ways as well with no success.

Reproduction

https://www.sveltelab.dev/?provider=github&owner=MilosNikolic&repo=bits-combobox-debounce-issue

Logs

No response

System Info

System:
    OS: macOS 15.1
    CPU: (8) arm64 Apple M1
    Memory: 540.75 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.2.0 - /opt/homebrew/bin/node
    Yarn: 1.22.19 - /opt/homebrew/bin/yarn
    npm: 10.8.3 - /opt/homebrew/bin/npm
    pnpm: 8.8.0 - /opt/homebrew/bin/pnpm
    bun: 1.1.29 - /opt/homebrew/bin/bun
  Browsers:
    Chrome: 130.0.6723.117
    Safari: 18.1
  npmPackages:
    @sveltejs/kit: ^2.8.0 => 2.8.0 
    bits-ui: ^1.0.0-next.49 => 1.0.0-next.49 
    svelte: ^5.1.13 => 5.1.13

Severity

annoyance

[huntabyte]

Thanks for the reproduction. I believe I know what is causing this and a possible way to resolve this.