Many thanks again for the image!
Wait, wait…in that case it looks different - the gap is at the other side of the brake rotor!
An explanation could be this:
If you look at the actual exploded drawings of the manual you find a big washer (part nr.: 340-06).
Just, that washer was intended for the old plastic freewheel only.
That means if somebody would mount erroneously newer freewheel plus mentioned washer… 