Great way to summarize cultural "economics"
Couldn't put the words on this pattern but sometimes all I care about is that someone cared about.
This is why I hate "interacting" with bots, scripts or AI/LLMs. It just wastes my time, again and again and again. Oddly enough not all humans understand that. About two months ago, a german developer involved with ffmpeg, spam-slopped their mailing list with AI (it was an AI proposal for some change to ffmpeg in the future). He still does not understand why that is a problem.
Something similar happened with PolyMC to PrismLauncher but that wasn't about AI, it was an absentee owner who came back and deleted everything he said was woke.
A reproducer might not actually be useful because there is basically no way short of fancy hardware tracing to figure out what the reproducer is doing.
Trying to figure out what to do based on possible future scenarios has a place, but not here when we are talking about a concrete present problem.
The rational choice would be to cut your losses and stop reading at that point. Once you realize zero effort went into the prompt, there's no longer any reason to read the output. The age old truism still applies: garbage in, garbage out.
If you think it's worthwhile, close the issue with a comment: "please rework this and show your work next time". Otherwise just close it without commenting and move on.
In my daily work I see these cases. It does help that the bugs that are filed contain a test case and some analysis by the agent.
It would not help to get ten identical bug reports all saying "I asked my agent to find a bug by prompting it with "find a bug and produce a test case". It found a nasty bug and a really nice reproducer. I'm not including its output here. Good luck!"