I use a search-based folder that simply combines the messages from the spam folders of multiple accounts. There is no actual query, it's set to "Match all messages". For several years now, that has resulted in a search folder where the first message in the list appears twice. I can't delete both of them, but if I delete one, and shift away, then go back, the duplicate is always gone. This is not exactly a critical bug, but it is annoying and causes a little extra work. It would be nice to have it fixed. I am currently running 140.5.0esr (64-bit) under Windows 10, but this has been true for quite a few versions back. Is there other information I can provide that would be useful?