If a camel leaps into a minecart, boat or raft, the leap animation doesn't end until either the boat/minecart is broken, the camel leaps out of the boat/minecart, or the world is reloaded.

To reproduce, it is a simple as placing a boat, raft or minecart and leaping toward it with a camel. 

The cause is most probably the change where camels do not end their leap animation until they touch the ground

Link to video: https://1drv.ms/v/s!AoZNrBfFy_Saggil9MAnkj0Jd4nC?e=6tXW0Y

Although the video only shows boats and rafts, the issue is also present with minecarts.