Fokker D.XXIII: First tractor/ pusher fighter???
After another round of arguments over the Dornier 335, I looked into the history and found this, a 1939 fighter that also used the push me-pull you propeller system. This was made by Fokker, which I only now realized was based in the Netherlands. Where this fits in the lineage of the Do 335 seems up in the air. It's hard to believe that it had no influence at all, but Dornier had been using tractor/ pusher propellers since the 1920s, so this might be a matter of the knockoff stealing back the original idea.
Edit/ add: And the photo does not show so here's a link.