CANCELMATINEE exec command doesn't work?

I’ve done an event dispatcher workflow to stop my matinee as I have to call it from my level BP but I noticed there’s an ‘is skippable’ checkbox on the matinee actor which says I should be able to do an exec command ‘CANCELMATINEE’. I’ve tried running that command from my player controller as well as level BP but neither seem to do anything, nor does the log spit out any hints.

Is this meant to work or am I doing it wrong?