Using Classic Outlook on Windows for personal email, calendar, and contact management
No, I'm convinced that is not a bug but rather just another "feature" designed push users into using MS apps and addons that they don't want and have already deleted on their ribbon. The constant ribbon reshuffling was most likely a marketing, not technical, decision.
I have already given up trying to find a fix or a workaround that works correctly all the time.
**** YOU MICROSOFT!