Using unstable_instrumentations client-side loses clientLoader.hydrate property

[ingoclaro]

Reproduction

Go to https://stackblitz.com/edit/github-u6zqfn2f?file=app%2Fentry.client.tsx
and check the project's console logs when loading the website

Then if you comment out the route.instrument function logs show up as expected.

// comment this out in entry.client.tsx
route.instrument({
      async loader(impl, info) {
        console.log('Loader start:', route.id, info.request.url);
        await impl();
        console.log('Loader end:', route.id);
      },
    });

System Info

System:
    OS: macOS 26.2
    CPU: (12) arm64 Apple M2 Pro
    Memory: 4.28 GB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 20.19.5 - /Users/ingoclaro/.nvm/versions/node/v20.19.5/bin/node
    Yarn: 4.11.0 - /Users/ingoclaro/.nvm/versions/node/v20.19.5/bin/yarn
    npm: 10.8.2 - /Users/ingoclaro/.nvm/versions/node/v20.19.5/bin/npm
    pnpm: 10.26.0 - /Users/ingoclaro/.nvm/versions/node/v20.19.5/bin/pnpm
    Watchman: 2025.10.13.00 - /opt/homebrew/bin/watchman
  Browsers:
    Edge: 143.0.3650.80
    Safari: 26.2
  npmPackages:
    @react-router/dev: 7.10.1 => 7.10.1 
    @react-router/node: 7.10.1 => 7.10.1 
    @react-router/serve: 7.10.1 => 7.10.1 
    react-router: 7.10.1 => 7.10.1 
    vite: ^7.1.7 => 7.2.7

Used Package Manager

npm

Expected Behavior

instrumentations should not affect the behavior of the app and clientLoader should run

Actual Behavior

when adding an instrumentation the clientLoader is not executed, also the instrumentation itself is not executed.

[brophdawg11]

This only looks to be an issue on hydration - client loaders run with instrumentations as expected on navigations

[github-actions]

🤖 Hello there,

We just published version 7.12.0-pre.0 which involves this issue. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!

[github-actions]

🤖 Hello there,

We just published version 7.12.0 which involves this issue. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!