`--experimental-config-file` broken in tests in 24.4.0

[JakobJingleheimer]

Version

24.4.0

Platform

macOS 15.5
ubuntu 24.4.0

Subsystem

test_runner

What steps will reproduce the bug?

Save to the following to node.config.test.json

{
  "$schema": "https://nodejs.org/dist/v24.4.0/docs/node-config-schema.json",
  "nodeOptions": {
    "experimental-webstorage": true,
  },
  "testRunner": {
    "experimental-test-module-mocks": true
  }
}

Create a test that uses mock.module and webstorage.

Run

node --no-warnings --experimental-config-file=./node.config.test.json --test './src/**/*.test.ts'

How often does it reproduce? Is there a required condition?

100%

What is the expected behavior? Why is that the expected behavior?

It works (like it does in node 24.3.0).

What do you see instead?

Neither feature has been enabled, resulting in the typical errors.

Additional information

Possibly/likely other options are also not working.

[JakobJingleheimer]

@nodejs/test_runner @marco-ippolito

[marco-ippolito]

It's a bug caused by not propagating the options from the config file to child process spawned from test runner

[pmarchini]

This issue should have been addressed by #59138!