Shortcut CMD+... does not work

My applicaton does not recognize the CMD+... shortcut.
I have one button defined as CMD+1, but my application recognizes only 1 and executes the wrong function (same as when I press only 1). I know, that my application check's the key-modifier event's of all special keys, but I do not know, what my application really receives in the case when I press my touchbar button with the shortcut cmd+1.

I have seen, that it is possible to split the key event's (up / down) for normal keys, but this option is not availlable for cmd (up / down). Otherwiese I would have checked to split the action in separate steps (cmd down, 1 down and up, cmd up).