https://www.reddit.com/r/talesfromtechsupport/s/K2xme9A0MQ

I once bisected to find a bug in a 6 month old commit. An off-by-one error in some array processing. I fixed the bug there to confirm. But on main, the relevant code didn’t even exist any more. It had been completely refactored away.

I ended up rebasing the entire 6 months worth of commits onto the bugfix, propagating the fix throughout the refactoring.

Then a diff against main showed 3 lines changed in seemingly unrelated parts of the code, together triggering the bug. I would never have found them without bisect and rebase.