Incorrect duration when going from city Zadar to Ist in Croatia

[DamirTomic]

Issue

Most land - island or island - island queries in Croatia return expected values. However, when plotting from Zadar to Ist or any island near it, OSRM estimation is off by at least 6 hours. In real-life, the ride takes 1hr 55min - 2hr 10min.

Steps to reproduce

Go to https://www.openstreetmap.org/ use OSRM
Set source: Zadar, Grad Zadar, Zadar County, Croatia
Set destination: Ist, Grad Zadar, Zadar County, 23293, Croatia

OSRM suggests a ferry ride (as it should), but instead of ~2hrs, ferry ride adds about 8hrs. Using Valhalla gives a much more accurate reading of 1hr 58 mins ferry ride. Not sure what's going on here since both Valhalla and OSRM suggest taking the same path and the path is the same distance (49km). I checked several dozen island - land and island - island combinations in OSRM and this is the only one that shows such a large difference from the real-life duration.

Specifications

Using https://www.openstreetmap.org/ on any OS.