Looking at this new detour I am seeing two points where traffic is blocked:

https://www.openstreetmap.org/node/2445064186

This lif gate is probably gone now isn't it? That node currently blocks all traffic except for pedestrians and cyclists.

https://www.openstreetmap.org/way/1361979771

This road is blocked for all vehicles, but it also is part of the new route for a few metres. It should probably be split between a small bit of secondary towards Wolferode, and a highway=unclassified towards the closed road.

I'm not familiar with this area; otherwise I would have done these fixes myself.