Bad luck. I will try to revive the topic at the home.pl forum. Thanks for your response after such a long time.
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Yes, it is, BUT… please, do—it is always a good thing to hope 
Today (6/20/2022) we had some activity regarding the issue reported to libetpan: Ignore some malformed XLIST replies · Issue #403 · dinhvh/libetpan · GitHub