Client tests do not run again when client code changes (headless with puppeteer)

Using the latest versions or `meteortesting:mocha` I only get `client modified, restarting` when changing client-side code but the tests do not re-run.

I need to either stop the process and start completely new or change server-side code. This is suboptimal for dev workflow. Any insight on this why this happens?

Start by reproducing the issue with the latest versions or meteortesting:mocha in the headless Puppeteer workflow. Observe the `client modified, restarting` path and compare it with a server-side change; done means client-side edits cause the client tests to run again without restarting the process.

Written by the indexing model from the issue text.