Whenever there is a "meeting now" in a team, it just shows me that a meeting has started not the join button. Then I had to join that through the mobile app, so it shows all the chat and everything as yesterday, like if I or someone else typed something in a chat, then it is shown today in the mobile app but as yesterday in the desktop app. The same goes for assignments mentioned today and other things which are not pre-scheduled. I got to submit assignments and join meetings through the mobile app instead of desktop one while it shows today's messages as yesterday. I am attaching the screenshots also.
the above are ss of desktop app and the mobile app showing same message yesterday and today respectively.