Replacing broken nexus 7 gear hub with second hand one
I took my bicycle to a local bicycle shop. They unfortunately told me that it should jump back to it's original position, and that opening the hub is the only way to find out what is wrong.

The good news is that all the nexus 7 gears can work with the same gear shifter. The nexus 7 SG7-R42 gear shifter is therefor compatible with the nexus SG7-R46.