Bug Reproduction

Startup

npm install
npm run dev

pnpm install
pnpm run dev

yarn install
yarn run dev

Reproduction

1. Open http://localhost:3000/use-client in your browser.
2. You will see a red text saying "Demo".
3. Open http://localhost:3000/rsc in your browser.
4. You will see a text saying "Demo" - however it is black.
5. Both texts will have the very same css class names.

Expected behavior

The text should be red in both cases.