Hi! In my Windows 11 and Thunderbird v115.2.2 Supernova I noticed that sometimes TB doesn't mark some e-mails as read! This happens randomly with different e-mails. I am selecting an e-mail to read it, then I browse the other unread e-mails in the list (by clicking the down arrow of my keyboard), and when I am going to the next e-mails, almost all are being marked as read, apart from one or two which stills unread! Even if I sit in the unread e-mail for more than 10 sec, the e-mail still remains unread. The only solution is to right click to it and select manually "Mark -> As Read". I am using POP protocol and Yahoo mail and Hotmail as mail servers.