🐛 Bug: mocha 11 with tsx breaks some modules

[tpluscode]

Bug Report Checklist

• I have read and agree to Mocha's Code of Conduct and Contributing Guidelines
• I have searched for related issues and issues with the faq label, but none matched my issue.
• I have 'smoke tested' the code to be tested by running it outside the real test suite to get a better sense of whether the problem is in the code under test, my usage of Mocha, or Mocha itself.
• I want to provide a PR to resolve this

Expected

Updating mocha from 10 to 11 should not break tests

Actual

Module from node_modules are loaded incorrectly when using tsx

Minimal, Complete and Verifiable Example

https://gist.github.com/tpluscode/f5f1248509068afa033797bb51bd7dea

Versions

> npx mocha --version
11.7.5
> node_modules/.bin/mocha --version
11.7.5
> node --version
v20.19.4

Same with node 24

Additional Info

No response

[mark-wiemer]

Thanks! Are you able to try this on 12.0.0-beta-10 by chance? I'll quickly clarify that all of us maintainers are extremely busy this month, but I'll add this to my backlog for sure :)

[tpluscode]

Yes, also broken with 12.0.0-beta-10