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I filed a bug report about incorrect behavior in a #FOSS app which I was able to reproduce immediately after I saw it happen the first time, but then not at all. I mentioned this clearly in my report, followed by, "...so it's intermittent rather than reproducible."
One of the maintainers replied, "I don't see that."
I tried for several minutes to come up with a polite way to say, "Which part of 'intermittent, not reproducible' do you not understand?" then gave up and said nothing.
#smdh