I found a (relatively minor) bug in Git and tried contributing a patch for it. That time it was definitely partially my "fault" that it didn't get merged, since

I found a (relatively minor) bug in Git and tried contributing a patch for it. That time it was definitely partially my "fault" that it didn't get merged, since I was new to C and their contributor process. The feedback on my patch was kind of overwhelming (something like "instead of your one-liner, it's probably better to fix the root cause of the issue by refactoring this and that..."). Didn't get around to it, then saw it got fixed by a regular contributor quite some time later. It was a bit discouraging, but I didn't feel robbed (since circumstances were different!) - and I realize it's difficult for maintainers to also find the time to onboard new contributors.