At which URL did you encounter the problem?

Happens with GitHub Actions CI builds, for example this build for a recent PR.

What steps will reproduce the problem?

1. Open a PR or perform some other action that will trigger a GitHub Actions CI build

What is the expected output? What do you see instead?

Expected that CI test jobs on PHP8 should either pass (preferred) or at least fail gracefully, as I think they used to do earlier when we switched to GitHub Actions. Instead they get stuck apparently at 189/469 (with a great many errors at that point) and time out after 6 hours, so the whole build gets stuck for a very long time.