Subfolders with unread mail not shown in bold
After upgrading to Thunderbird 91.2.1 (32 bit edition) second level subfolders with unread mail are initially not shown in bold (folder 'Alarms' in the second image). The number of unread emails in brackets *is* shown. After a minute or so (and unclear actions?) the folder with unread emails appears in bold (folder 'Alarms' in the third image). First level folders with unread emails *are* shown in bold (folder 'Google' in the first image).
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Same problem -- new with 91.3, though; have never seen this before.
Top-level folder or account name is highlighted (bold) with number and down-arrow. Subfolder shows number in brackets, but is not highlighted.
Happens only with incoming messages -- and only if folder/account is not expanded when mail is retrieved.
If the account name is expanded when mail arrives, the top-level folder does get highlighted (but not any subfolders).
If the top-level folder is not expanded when mail arrives, the subfolders do not get highlighted.
Hello, I have this problem, too. Win10 21H1 Home, Tbird 91.3.1 64 bit. First notice when I upgraded to 91.3.0 from {whatever I was running before. . . . }. OP perfectly describes what I see.