OSRM bicycle route has huge detour and wrong duration

[spixi]

Issue

L39 has cycleway:both=shoulder and should preferred over the huge detour via K21. Alternatively a route via Sang would be acceptable.

Also the duration is completely wrong. Nobody can ride 15 km in 17 minutes.

Steps to reproduce

https://www.openstreetmap.org/directions?engine=fossgis_osrm_bicycle&route=51.43408%2C6.26925%3B51.40081%2C6.30512#map=13/51.42752/6.30770

[spixi]

https://routing.openstreetmap.de/debug/bike.html#15.47/51.4304/6.2763
It seems that OSMR uses 15 km/h for L39, but the bicycle paths on the detour are calculated with 127 km/h and 65 km/h. This causes the huge detour and wrong duration.