im just Playing around with the end gateway on the latest preview until i summon a oak boat with chest on the end gateway it just craches the game 

Steps to Reproduce:
1. Go to a world
2. go to the end
3. find a end gateway and summon any entity on the end gateway

Observed Results:
The Game will crash when the entity go to the end gateway

Expected Results:
The Game will Not crash when the entity go to the end gateway