Hi @VictorLerp !
Thanks for your reply.
I did like you said. But there was no answer I found, why this stopped working.
So I just created a new BP Class with just a Collisionbox. DId the same thing to load a new level and this worked. So I have still no idea why the trigger was not working anymore, but I found a workaround to get this back to a working game.
Thanks again, your answer motivated me to dig even deeper i thought I could do!