Calculating a route I saw a terrible route.

Start (green): 52.804074329307014,7.860560745843029

Destination (red): 52.79903996107103,7.846146697991908

Germany, Niedersachsen, near Lastrup. Standard-Car-Profile without any modification. Germany-latest or Niedersachsen-latest.

Other routers are ok.

A lot of search, now a solution.

The NetworkSimplificationEpsilon has a standard value of 1.0.

Removing this (= 0.0), the error is gone.

_loadSettings = New Itinero.IO.OSM.LoadSettings()
_loadSettings.NetworkSimplificationEpsilon = 0.0
_routerDb.LoadOsmData(_fS, _loadSettings, Vehicle.Car)

NetworkSimplificationEpsilon
Gets or sets the network simplification epsilon (in meter). When zero no network simplification is done.

Looks like this network simplification has some bad effects.