What you are describing is “Toggle Switch” mode (it is the default). When I was discussing with fibaro tech support, I was informed that Momentary switch would only open/activate the switch for a “moment” and then shut down again. Did I not understand correctly?
Meantime, is there a parameter that I could change so I do not send 220V through my fibaro to my garage gate? Or am I stuck with putting an old school relay switch between the fibaro and the gate?