Sometimes I've had a pr merged. Sometimes I've had stubborn maintainers that think that their project should not follow common domain standards for /shrug reasons.
And then many other times I honestly don't have the knowledge to be able to contribute into large third party systems and it seems very rare to get an issue resolved without submitting a pr.
And lastly sometimes it's hard to judge if unexpected behavior is really a 'bug'. Similar to the last point, it can honestly be hard to tell the difference sometimes.