UTF-8 character not showing properly in tmux

Starting tmux with u flag solves this issue

tmux -u

I've created an alias of tmux in my zshrc

alias tmux='tmux -u'

Thanks for the flag part, but we can also set the below to the profile rc (e.g. .zshrc or bashrc) file

export LC_ALL=en_IN.UTF-8
export LANG=en_IN.UTF-8

With this option set, no need to use the -u flag.