projects does not work with browser mode

Describe the bug

running vitest in a monorepo, fails to work (stalls - noting happens) when packages use browser mode.

This is the exact same behavior as described here: https://github.com/vitest-dev/vitest/issues/9164

Happening on 5.0.0-beta.1 as well as on latest v4.

When running non headless vitest page display 'no test found'

Test run in non-browser environment (happy-dom).

Reproduction

tried simplified repro without success.

However, I suspect version conflict between root and package. Below is the output trace after a Ctrl+c.

Vitest caught 1 unhandled error during the test run.
This might cause false positive tests. Resolve unhandled errors to make sure your tests are not affected.

⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ Unhandled Error ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯
Error: Failed to run the test /home/christophe/Programming/preignition/accessibleData/app/app-survey/renderer/renderer.test.ts.
 ❯ node_modules/.pnpm/vitest@5.0.0-beta.1_@opentelemetry+api@1.9.1_@types+node@25.6.0_@vitest+browser-playwri_53592e796b1c9a9e525229a5f01a8ec0/node_modules/vitest/dist/chunks/cli-api.MLtHkHGf.js:2627:17
 ❯ processTicksAndRejections node:internal/process/task_queues:105:5

Caused by: Error: [vitest] Browser connection was closed while running tests. Was the page closed unexpectedly?
 ❯ WebSocket.<anonymous> node_modules/.pnpm/@vitest+browser@5.0.0-beta.1_vite@8.0.10_@types+node@25.6.0_esbuild@0.27.7_terser@5.46._83b033ee639ed61e333e1cbaf5290842/node_modules/@vitest/browser/dist/index.js:3055:16
 ❯ WebSocket.emit node:events:519:35
 ❯ WebSocket.emitClose node_modules/.pnpm/ws@8.20.0/node_modules/ws/lib/websocket.js:273:10
 ❯ Receiver.receiverOnFinish node_modules/.pnpm/ws@8.20.0/node_modules/ws/lib/websocket.js:1214:20
 ❯ Receiver.emit node:events:507:28
 ❯ finish node:internal/streams/writable:953:10
 ❯ node:internal/streams/writable:934:13
 ❯ processTicksAndRejections node:internal/process/task_queues:90:21

Caused by: Error: [birpc] rpc is closed, cannot call "createTesters"
 ❯ node_modules/.pnpm/@vitest+browser@5.0.0-beta.1_vite@8.0.10_@types+node@25.6.0_esbuild@0.27.7_terser@5.46._83b033ee639ed61e333e1cbaf5290842/node_modules/@vitest/browser/dist/index.js:2917:34
 ❯ Proxy.$close node_modules/.pnpm/@vitest+browser@5.0.0-beta.1_vite@8.0.10_@types+node@25.6.0_esbuild@0.27.7_terser@5.46._83b033ee639ed61e333e1cbaf5290842/node_modules/@vitest/browser/dist/index.js:2916:18
 ❯ WebSocket.<anonymous> node_modules/.pnpm/@vitest+browser@5.0.0-beta.1_vite@8.0.10_@types+node@25.6.0_esbuild@0.27.7_terser@5.46._83b033ee639ed61e333e1cbaf5290842/node_modules/@vitest/browser/dist/index.js:3055:9
 ❯ WebSocket.emit node:events:519:35
 ❯ WebSocket.emitClose node_modules/.pnpm/ws@8.20.0/node_modules/ws/lib/websocket.js:273:10
 ❯ Receiver.receiverOnFinish node_modules/.pnpm/ws@8.20.0/node_modules/ws/lib/websocket.js:1214:20
 ❯ Receiver.emit node:events:507:28
 ❯ finish node:internal/streams/writable:953:10
 ❯ node:internal/streams/writable:934:13

System Info

System:
    OS: Linux 7.0 Linux Mint 22.3 (Zena)
    CPU: (16) x64 AMD Ryzen 7 7840U w/ Radeon  780M Graphics
    Memory: 20.41 GB / 30.65 GB
    Container: Yes
    Shell: 5.2.21 - /bin/bash
  Binaries:
    Node: 23.6.1 - /home/christophe/.nvm/versions/node/v23.6.1/bin/node
    npm: 11.2.0 - /home/christophe/.nvm/versions/node/v23.6.1/bin/npm
    pnpm: 11.0.3 - /home/christophe/.nvm/versions/node/v23.6.1/bin/pnpm
  Browsers:
    Chrome: 147.0.7727.137
    Firefox: 150.0.1
    Firefox Developer Edition: 150.0.1
  npmPackages:
    @vitest/browser: catalog: => 5.0.0-beta.1 
    @vitest/browser-playwright: catalog: => 5.0.0-beta.1 
    @vitest/browser-preview: catalog: => 5.0.0-beta.1 
    playwright: catalog: => 1.59.1 
    vite: catalog: => 8.0.10 
    vitest: catalog: => 5.0.0-beta.1

Used Package Manager

npm

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

The issue names renderer/renderer.test.ts as the failing entry point and references issue #9164; begin by reproducing browser mode in the monorepo and inspect the createTesters/WebSocket failure. Done means browser-mode tests no longer stall or report no tests, including the reported non-headless case.