Remote form redirect sometimes does not refresh queries in Firefox

Describe the bug

My understanding is when a form remote function redirects, all queries should be invalidated by default. Ever since version 2.65.1 I've found that occasionally, in Firefox only (not Chrome/Safari), when I navigate from a list view to a new form, submit the form using a remote form function which redirects back to the list view, the list is not always updated. This only happens when there is another remote query in the layout (in my case, a requireUser query) that is shared across the list and new form routes. What happens is only the requireUser query is refreshed.

Likely introduced by https://github.com/sveltejs/kit/pull/16014 which is in the code path for refreshing queries after redirect and listed in the 2.65.1 changelog.

Reproduction

Here is a video demonstrating the issue:

https://github.com/user-attachments/assets/c75f5f48-a1a2-4d28-9dc7-40f0fd06b0a3

Here is https://github.com/davekaro/kit-refresh-issue to a purely AI generated reproduction with scripts to verify works in Chrome but not in Firefox. Also, this repo includes the SvelteKit app from the video above that demonstrates the issue.

Logs

System Info

System:
    OS: macOS 26.5.2
    CPU: (12) arm64 Apple M3 Pro
    Memory: 262.16 MB / 36.00 GB
    Shell: 4.7.1 - /opt/homebrew/bin/fish
  Binaries:
    Node: 26.5.0 - /Users/dave/.local/share/mise/installs/node/latest/bin/node
    npm: 11.17.0 - /Users/dave/.local/share/mise/installs/node/latest/bin/npm
    pnpm: 11.13.0 - /Users/dave/.local/share/mise/installs/pnpm/latest/pnpm
    bun: 1.3.14 - /Users/dave/.local/share/mise/installs/bun/latest/bin/bun
    Deno: 2.8.2 - /opt/homebrew/bin/deno
  Browsers:
    Chrome: 150.0.7871.128
    Firefox: 152.0.6
    Safari: 26.5.2
  npmPackages:
    @sveltejs/adapter-node: 5.5.7 => 5.5.7
    @sveltejs/kit: 2.70.1 => 2.70.1
    @sveltejs/vite-plugin-svelte: 7.2.0 => 7.2.0
    svelte: 5.56.6 => 5.56.6
    vite: 8.1.5 => 8.1.5

Severity

serious, but I can work around it

Additional Information

No response

Run the linked kit-refresh-issue reproduction in Firefox and Chrome, then inspect the redirect query-refreshing code path introduced by PR 16014 and the 2.65.1 changelog entry. Reproduce the case with a shared requireUser remote query; done means the list query refreshes after the remote form redirect in Firefox as it does in Chrome and Safari.