Logging off while standing on iron trapdoors causes the player to fall through them.

Partner Rank: 3

Partner Team Reporting: Gamemode One

Verification builds: Minecraft-Release_UAP_x64_2388834 Minecraft.Windows_1.12.11.0_x64_UAP.Release_Test

Summary:

When the player closes a world and reopens it, they will fall through any iron trapdoors they are standing on.

Impact:

This bug has no effect on any of our current content. However, it has great potential to hard-lock maps as it allows players to get stuck in areas normally not accessible.

Repro Steps:

1. Open a world. Place some iron trapdoors several blocks above the ground, like a floor.
2. Stand on top of the trap doors (make sure you are not flying).
3. Close your world.
4. Reopen your world.
5. Observe your new position.

Observed Results:

When you log into the world, you will find yourself on the ground, below the trapdoors.

Expected Results:

When you log in, you should remain in the location you logged off, atop the trap doors.

 

Regression Builds:

As far as I know, this has always been the case.