Hello,
under the following circumstances thunderbird does not update the number of new mails in the icon in the taskbar.
When a new mail arrives and is moved to a local subfolder by a filter, the "1" is displayed in the icon in the taskbar and also the "1" is also displayed in the subfolder for the new email.
When this email is read, the "1" in the subfolder disappears, but the "1" remains in the taskbar icon.
Only when new messages are retrieved with F5 or Shift+F5 does the "1" also disappear from the taskbar icon.
The error can be reproduced at any time.
Version 115.4.2 64bit
Windows 10
Yours sincerely
Christof
