Issue description
I am getting "WARNING: terminal is not fully functional" when I try to set. I could fix this by setting default-terminal to xterm-256color or by setting export TERM=xterm-256color but I am not sure this is the correct way to fix this. I pretty sure I am missing something.
echo 'set -g default-terminal "tmux-256color"' > test.conf
tmux -f test.conf
Required information
Darwin i386
tmux 3.1b
xterm-256color
MacOS Catalina 10.15.5
tmux installed via homebrew
Using default Terminal.app
tmux-client-16221.log
tmux-out-16223.log
tmux-server-16223.log