> ...isolating a bug for someone...

I think you mistakenly switched the roles there. You are not isolating a bug for the author. The author is using their software and is happy with its current state. It is you that is being hit by a supposed bug, and you are isolating it for yourself. Then you are expecting the author to do the additional work for you and handle your supposed fixes. Don’t get me wrong, you’re probably both helping each other in the best spirit of open source, but it’s not you who’s the ideal of generosity there.