[Description] Pathe calculation for embarked units has been observed. Moving/queueing units to disembark does not follow the shortest route or reasonable route. Units tend to avoid disembark even at the expanse of moving much more tiles. This bug seems to happen more frequently if...

1) there are multiple possible routes to destination
2) the units have more movement points, thanks to world wonder or emblematic trait.

3) the area near the destination is not yet fully explored.

4) the area has winding coastline/shoreline just like that of ria(see below)

*ria: A ria (/ˈriːə/) is a coastal inlet formed by the partial submergence of an unglaciated river valley. [From wikipedia]

[Steps to reproduce]

Order embarked land units on a coastal tile to move to land-based destination, including disembarking phase.

[Reproducibility]

I wasn't very luck to experience fully naval-focused gameplay, so please note that it could be biased a bit. I would give 3/5. 

[Expected behaviors]
Units should disembark properly without refusing to disembark or wasting more turns on coastal tiles.

[Screenshots]

Ordering a unit to move onto the land tile, which has only one or two possible route is likely to work without any bug.

A case of multiple possible route and unexplored map causing some glitches.

An embarrassing case. The unit should move to adjacent coastal tile and then try to disembark onto the destination.