I've got the the same setup on ubuntu, debian and 2 termuxes. It works as expected on ubuntu and debian, but in termux i need to have 'alias sou="source ~/.oh-my-zsh/custom/plugins/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh" ' and "sou" in every tmux pane...
I've got the the same setup on ubuntu, debian and 2 termuxes. It works as expected on ubuntu and debian, but in termux i need to have 'alias sou="source ~/.oh-my-zsh/custom/plugins/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh" ' and "sou" in every tmux pane...