Hi,
I fixed a routing error by merging the separate unconnected end points of your new ferry line to node https://www.openstreetmap.org/node/83560399#map=19/37.90583/20.70649 such that it got connected to the pier https://www.openstreetmap.org/way/77669809#map=19/37.90522/20.70794. I cannot provide more details because user CharliePlett edited the ferry route again just a few minutes ago. As I don't know which way you meant by "the line" I cannot reproduce what your note that it does not show up. I can only say that I do see the ferry route in JOSM and also on lower zoom levels of the carto rendering.