All kinds of open source projects do this too. It's really annoying. It's one thing if the authors actually try and fail to verify the bug, but these days it seems like most projects just close "stale" bugs as a matter of course. This is equivalent to assuming that any given bug is automatically fixed after X amount of time, which is pretty absurd.
It's rather unreasonable to be annoyed. The maintainers may have entirely different priorities, which is fine. They're also likely being spammed with low-effort bug reports (not yours necessarily but from others).
The great thing about open source projects you can just fix the bug yourself and submit a PR, or fork the whole project if the maintainers won't merge your changes. If you don't have the time or skills yourself then you can even pay a contractor to do it for you.