The 'new' Teams is unusable. I sent a message to my supervisor yesterday morning and when I looked for a response in the afternoon, it hadn't sent. I had to restart everything to get a single message to send. Pretty awesome that the 'new' Teams could have actually jeopardize my job due to this awesome new update. Luckily, everyone at my job is aware of how awful the 'new' Teams is and everyone I've talked to (dozens of people) are experiencing the same problem.
Another bonus, when I switched back to 'old' Teams, suddenly I have 3 Team's messages I didn't know about. Found that out today. I had messages that were sitting in limbo on the 'new' Teams that I couldn't get until I switched back to the 'old' Teams. I get it that it is Microsoft's job to make something that works and slowly update it until it doesn't work anymore. But maybe Microsoft should have taken their foot of the accelerator for a few more updates before they totally destroyed this app. As usual, terrible job Microsoft.