Bug Desc : Leaving a boat while you are inside the overworld end portal block will teleport you into the end at the overworld coordinates that you leave the boat.

Ex: Get in the boat and drive it into the stronghold portal. Your overworld coordinates are 100, 50, 100. Leave the boat. Enter the end at 100, 50, 100.

To reproduce : 

1. Drive a boat into the activated end portal in the overworld.
2. Press shift to leave the boat
3. Appear in the end at the coordinates of the overworld end portal.

Expected :

Leave the boat while in the end portal and spawn in at the end obsidian platform.

Reality : 

Leave the boat while in the end portal and spawn in the end at the same overworld coordinates.

Note: I did not try this for the snapshots. This does not work for the end's dragon portal.