Just for sure everything could happen. One time after no issues/pr in one project other things took my attention and I did not received a notification. However it does not mean that I did not wanted to work on the project if somebody have any requests. It’s always best to find an author somewhere else and make sure your message is read. In my case I’m everyday visiting this forum many times, so there is lots of cases to read a private message if everything else fails.
That’s said in most cases project which has contributors, issues and is not updated by the maintainer for many months and especially years could be rather considered as dead. It would be helpful if such sites would give some feedback on such projects like:
It seems that there was no new commit merged into main branch for over 6 months, but at least one of the projects maintainers logged in the meantime (last time on …).