My "favourite" Teams bug is just swallowing input in chat [1]. I mean c'mon, a networked chat app is basically a sophomore year CS assignment, and not demanding at that. Swallowing/droping input would be enough to fail the grade. But somehow, one of the richest companies in the world, own by a business mogul that's also a symbol of the tech industry, cannot get it right. That's mind boggling.

[1] Sometimes, when I open a new chat and quickly start typing, after 2-3 seconds the whole window suddenly redraws and whatever I've managed to type in so far is no longer there...