(RSC) `loader` is not working on react canary

[hi-ogawa]

Reproduction

Reproduction is in the fork of template repo https://github.com/hi-ogawa/react-router-templates/tree/chore-repro-loader-canary. React canary is configured in pnpm-workspace.yaml overrides. loader is added in unstable_rsc-parcel/src/routes/home/route.tsx and unstable_rsc-vite/src/routes/home/route.tsx

Both on Parcel and Vite, a request gets stuck when accessing a home page.

# access http://localhost:3000
pnpm -C unstable_rsc-parcel/ dev

# access http://localhost:5173/
pnpm -C unstable_rsc-vite/ dev

I added CI for canary/experimental channels on @vitejs/plugin-rsc vitejs/vite-plugin-react#630 and noticed react router example is not working. I'm not sure if you plan to support non stable channels, but I thought I'd raise it here in case you are interested.

It's quite awkward but @vitejs/plugin-rsc's canary/experimental build can be found here vitejs/vite-plugin-react#524 if you want to test it out.

It looks like this is dev only. Maybe it's a React bug?

System Info

System:
    OS: Linux 6.14 Arch Linux
    CPU: (16) x64 12th Gen Intel(R) Core(TM) i7-12650H
    Memory: 23.19 GB / 31.05 GB
    Container: Yes
    Shell: 5.2.37 - /usr/bin/bash
  Binaries:
    Node: 22.14.0 - ~/.volta/tools/image/node/22.14.0/bin/node
    Yarn: 1.22.22 - ~/.volta/tools/image/node/22.14.0/bin/yarn
    npm: 10.9.2 - ~/.volta/tools/image/node/22.14.0/bin/npm
    pnpm: 10.13.1 - ~/.volta/tools/image/node/22.14.0/bin/pnpm
    bun: 1.2.18 - ~/.local/bin/bun
  Browsers:
    Brave Browser: 137.1.79.119
    Chromium: 136.0.7103.113
  npmPackages:
    react-router: 7.7.0 => 7.7.0 
    vite: ^6.3.5 => 6.3.5

Used Package Manager

pnpm

Expected Behavior

Loader works

Actual Behavior

Loader doesn't work