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Or when you’re having a problem with a piece of accounting software that nobody has ever had, so you call in for phone support, and they’ve never had it, but they can reproduce it on their side, find a solution, and thank you very much for letting them know.
Ohh I had a similar experience with a quite big open source project (~10k stars on GitHub). Posted an issue, it’s obscure enough even the lead maintainer comes in to help and still got stuck unable to fix the issue.