I experience proper zsh-syntax-highlighting (see here) when first opening a shell session, but as soon as I enter tmux, the syntax highlighting no longer appears. I found this Github issue describing a similar but seemingly different problem, as the user is able to see syntax highlighting within the first pane.I first installed zsh, then oh-my-zsh, and then finally zsh-syntax-highlighting via pacman on Arch and sourced it at the bottom of my .zshrc (without any conditionals)like so:source /usr/share/zsh/plugins/zsh-syntax-highlighting/zsh-syntax-highlighting.zshI don't understand why specifically that feature does not seem to work in tmux. All other configurations/themes/plugins/sourced files seem to work well except for this one. What am I missing?EDIT: The TERM variable in .zshrc is export TERM=xterm-256colorEchoing $TERM outside tmux gives xterm-256color. The TERM variable in .tmux.conf is set -g default-terminal screen-256color.Echoing $TERM inside tmux also gives xterm-256color. 
No zsh-syntax-highlighting within tmux
zsh;oh my zsh;syntax highlighting