In the first image you can see I can disembark on 1 turn on the tile near Constantinople. In the second image you can see the path chosen (2 turns) to disembark on the tile near Nicaea. It seems to be a bug in the pathfinding algorithm. Maybe it's related to Elisabeth's UA.
EDIT: removed the savegame because the bug is now fixed.
EDIT: removed the savegame because the bug is now fixed.