[Bug]: test-ci-partial fails with FORCE_COLOR #16497

Version

30.5.2

Steps to reproduce

citgm jest fails as described in nodejs/citgm#1156. The issue is also reproducible using the same script sequence as defined for citgm without actually calling citgm:

Ubuntu 26.04.1, Node.js 24.21.0 LTS

git clone https://github.com/jestjs/jest
cd jest
git checkout v30.5.2
corepack enable yarn
yarn
export CI=1
yarn build:js
yarn remove-examples
yarn test-ci-partial

Expected behavior

yarn test-ci-partial should succeed

Actual behavior

Running yarn test-ci-partial as set up to test in https://github.com/nodejs/citgm fails in

passes fork options down to child_process.fork, adding the defaults

with a mismatch due to

• "FORCE_COLOR": "1",
  

• Whereas yarn test-ci-partial fails
• the related yarn-test-ci-partial:parallel succeeds

Additional context

• companinion issue to jest fails in all current variants nodejs/citgm#1156

Environment

System:
    OS: Linux 7.0 Ubuntu 26.04.1 LTS 26.04.1 LTS (Resolute Raccoon)
    CPU: (8) x64 13th Gen Intel(R) Core(TM) i7-13700
  Binaries:
    Node: 24.21.0 - /home/mike/n/bin/node
    Yarn: 4.18.0 - /home/mike/n/bin/yarn
    npm: 11.19.0 - /home/mike/n/bin/npm
  npmPackages:
    jest: workspace:* => 30.5.2