I downloaded somebody's GitHub code to use for a project. It had a bug that broke functionality, so I fixed it and started running it to gather data. Then it stopped working for a different reason. I rechecked out the code fresh, same (second) issue occurred. It was a second bug, that once I fixed it, everything worked. But I didn't need to fix it the first time! There weren't any commits in the last two months! I blame ghosts.