Speaking personally, I’m all for improving transparency by tying as many things together (bug reports, pull requests, release notes, etc.), but a balance is needed to avoid taking time away from actually fixing the bugs.
I try to post relevant PRs to their related bug reports (see for example here), but there are reasons why this may not happen (e.g. simply not realising that the fix relates to this bug).
As community members, one thing you can do to help, if you want to, is occasionally check the PRs for relevant projects to see whether there are any targetting a bug report you know about.