Attempting to go through an end gateway riding a boat sometimes prevents player from moving until world is reloaded

Attempting to go through an end gateway riding a boat may cause a desync, preventing the player from moving until the world is reloaded. Discovered while testing MC-149242.

Sometimes the log is spammed with "Boat (vehicle of <name>) moved wrongly!", indicating that the server is receiving incorrect vehicle movement packets (MC-173021).