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#4283 (comment)
@washcroft
res=connection.recv(4)
which is, apart from swallowing data without using them, uselessIyou (<--edit) surely could have proposed a fixWell... Yes. I didn't change it for pleasure :) I was fixing some other issue.
I can't imagine finding this bug was easy, so a way to fix it might also have popped out from your research, that was @devyte's question.