Running a command from whiskermenu using ! should run that command in a terminal. Command appears to run but terminal opens then closes immediately. Command run using ! in whiskermenu exo-open --launch TerminalEmulator %s
If you do not run a program that waits for user input, it will not stay open. It is working exactly as intended (and exactly the same as the application finder).
That's fine. I 'm happier knowing it's just bad wording than a real bug.