`git bisect` is interesting option. I haven't heard about it before. Thanks for info. Still learning something ;)

I'm old school. I used to do "manual bisection" on git history by just `git checkout <commit_id>` until I find first introducing bug commit.

Then another "bisection" on commit changes until minimal change found.

Deterministic bugs are quite "fine". For me personally worst are randomly occurring bugs in specific conditions for eg. some race conditions.