User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:64.0) Gecko/20100101 Firefox/64.0
Steps to reproduce:
New Mail Alert enabled. Folders currently set to UNIFIED, but this problem still occurs when set to ALL as well.
For whatever reason, my 1st email becomes highlighted, triggered the NEW EMAIL icon to appear in the taskbar. There is however no new email at all in the actual inbox. I have to click on one of the subfolders to remove the highlight. For some reason this problem doesn't effect my 2nd email account.
It's very annoying have to click on the subfolder in order to clear the alert.
(also I just noticed that I'm still using an older version of thunderbird, I'll be updating to see if this problem was fixed by then, kinda doubt it.)
I expect not to receive any alerts at all unless I actually do receive a new email. The inbox should be the ones highlighted. Not the one that has a lock icon.