Weird CH routing, does not occur when switched to ALT:
https://maps.openrouteservice.org/directions?n1=49.480495&n2=8.472052&n3=17&a=49.480833,8.4718,49.480234,8.472852&b=0&c=0&k1=en-US&k2=km

Even though the illegal turn can be explained by the fact that CH does not support turn restrictions, it is surprising that the longer route is seen as better than just going straight through the crossing!