Okay thanks for the quick reply. I will compare further 
EDIT: Figured out that I didn’t have the depth-Plane in my Blueprint… Why is needed?
EDIT2: If anyone is making their own ocen_bp and faces the same problem of the becoming invisible at some points after adding the depth plane -> make sure you start with a normal empty actor -> not a static mesh actor or anything -> because some static mesh lighting and rendering options are greyed out on static mesh actors (actors can be reparented in the file menu in the editor).