Thanks gardenBiker. It concerns this ferry route: https://www.openstreetmap.org/way/146383135
The ferry doesn't seem to be running anymore. At least, I can't find it on https://www.jadrolinija.hr nor on aggregators like aferry.com and directferries.com.
But before the ferry link is deleted from the map, it might be prudent if someone with local knowledge confirms that the ferry is discontinued.