And the reason I don’t see this bug on my mac is because <PYENV> comes before <PYPATH>, yes?

The ordering doesn’t matter for

interpreter_search_paths

. It works on your mac because you have interpreters in two distinct directories, so you’re not hitting this edge case where the sibling interpreters to the current interpreter are not considered. The issue is that CI has everything in a single directory (Which, again, should be fine. Pex bug)