Since #66806: Don't let regular users re-open closed issues → , issues can not be reopened by mere mortal users. Which is a good thing.
But some documented guidance how regressions should be handled, could help.
Example: there was quite some confusion how to handle a regression in
#2828620: Regression: View pane rendering misuses and floods cache →
So, technically speaking, this is a documentation bug as followup from #66806: Don't let regular users re-open closed issues → .
Also: in ye olde days, when reopening an issue as of a regression, all subscribers were notified, which was a good thing. This is not the case anymore.
So, technically speaking, this is a feature regression as followup from #66806: Don't let regular users re-open closed issues → .
(Feel free to separate these issues, i felt like starting with both and sorting this out might be better at first.)
Postponed: needs info
Missing documentation
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It's likely this issue predates Contrib.social: some issue and comment data are missing.