tmux exits with [exited] 1;2c on macOS catalina
Solution 1:
I encountered same problem for byobu.
I tried
pkill byobu..
not resolved...
Then I tried
pkill tmux
and it solved the problem for me...
The problem might've been due to tmux upgrade which was earlier this morning...
tmux 3.1a -> 3.1b
Also check this link to another related answer.