Blocks placed at spawn in the End disappear when the player dies and immediately returns to spawn.

This report contains a video to help demonstrate the problem. I am also giving some context to the video here. 

 

Prior to the video the two players had just died and returned to the End. They are currently at spawn. Purrsephonie places the torch on the right wall and the netherrack on the ground to the right and the ceiling on the left. Purrsephonie'bed is just outside the End Portal.

 

You will see Purrsephonie putting in coordinates in an attempt to return to where they died. Purrsephonie then falls out of the world. Purrsephonie immediately returns to the End through the End Portal. The background flashes and the torch and netherrack are gone. 

 

This was the third time this happened. After it happened twice the scenario was repeated for the purpose of creating the video.

 

Steps to recreate

1. Get two players
2. Both players go to an end portal with some blocks and a bed.
3. Player one places s bed on the floor next to the portal and sets their respawn point
4. Both players enter the End Portal 
5. Player one places some blocks and then teleports to their death by falling out of the world 
6. Player two remains at spawn
7. Player one enters the End Portal immediately after respawn

Expected results: The blocks just placed by player one remain as placed

 

Actual results: The blocks just placed by player one despawn with player one's return to The End