Navigating throws error: `parts is not iterable`

[eunukasiko]

Describe the bug

On every navigation:

TypeError: parts is not iterable (cannot read property undefined)
    at http://localhost:3000/node_modules/.vite/deps/chunk-AP5KWWQF.js?v=85ac07ec:3196:11
    at execute_signal_fn (http://localhost:3000/node_modules/.vite/deps/chunk-ELXA3TAP.js?v=85ac07ec:666:7)
    at execute_effect (http://localhost:3000/node_modules/.vite/deps/chunk-ELXA3TAP.js?v=85ac07ec:787:31)
    at flush_queued_effects (http://localhost:3000/node_modules/.vite/deps/chunk-ELXA3TAP.js?v=85ac07ec:830:13)
    at process_microtask (http://localhost:3000/node_modules/.vite/deps/chunk-ELXA3TAP.js?v=85ac07ec:852:3)

https://github.com/sveltejs/svelte/blob/main/packages/svelte/src/internal/client/render.js#L1377

Problem arised when changed code to runes mode.

Reproduction

Navigate in runes mode

Logs

No response

System Info

System:
    OS: macOS 13.6.5
    CPU: (12) x64 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
    Memory: 211.03 MB / 32.00 GB
    Shell: 3.2.57 - /bin/sh
  Binaries:
    Node: 20.11.0 - ~/n/bin/node
    npm: 10.2.4 - ~/n/bin/npm
  Browsers:
    Chrome: 122.0.6261.112
    Safari: 17.4
  npmPackages:
    svelte: ^5.0.0-next.72 => 5.0.0-next.72

Severity

annoyance

[dummdidumm]

Please provide a reproduction, you can use sveltelab.dev for example - or if it's reproducible just with using npm create svelte@latest and using Svelte 5, then that's also ok, but we need some kind of reproduction.

[eunukasiko]

I'm unable to isolate the issue. I downgraded to 5.0.0-next.65 for now, which doesn't have this issue.