Using older versions of Outlook for Mac for personal email and calendar
Just got this update via chat/support:
With regard to the issue, we were able to identify this behavior as a BUG and it is fixed in our latest beta (Insider Fast) ring and we assume that this fix will soon be released to all users in the upcoming updates. I would request you to wait until this is introduced in the Current build (Production build). For immediate fix, we would recommend you to update Outlook to beta version 16.76.23070700 and check if it helps.