I only have a sample size of one Schlumpf bike I've done an install and some maintenance for, but it appears normal. See page C-1 of the user manual you link to. 

[![enter image description here][1]][1]

The "some play between the cranks and chainring in the direction of rotation is normal" clause is what's relevant here. Basically it's fine, they all do it.

  [1]: https://i.sstatic.net/bCmJU.png