We had a user today that experienced an issue after sending an emoji in a chat with one other user.
The message appeared cut-off at the time stamp. and any messages after were unable to be seen. The message receiver saw it normally and was able to respond normally, however as mentioned already, the affected user was unable to see any new message that came in; Except for the "preview" that is shown in the side window.
They were able to restart teams and have the issue resolved, but thought id point out the bug in case more users have this issue. I didn't think to take a screenshot at the time, but I will if it happens again.