Although MC-270749 is marked as "Fixed", enter an end gateway doesn't always grant the advancement "Remote Gateway".

Steps to reproduce:

1.Throw an ender pearl into an end gateway. (Make sure you haven't already grant that advancement)

2.If the "Remote Gateway" advancement is granted, run the command /advancement revoke @s only minecraft:end/enter_end_gateway and try again. (This might need 5-10 tries)

Observed result:

Sometimes you will teleported through the end gateway and doesn't grant the "Remote Gateway" advancement. 

Expected result:

You will always grant the advancement "Remote Gateway" when teleported through end gateways.