Teleporting to the place of a block with a hitbox will cause the player to go through the block below too. To replicate, go some blocks up and place a stone block with a carpet on top. Teleport far away and then teleport back to the position of the carpet. You will then go through the stone and fall to the ground.
This bug is most likely related to the fix of MC-149916
Comments 6
I'm having the same issue. I have only tested this in 1.13.2 and 1.14.2, but the bug only appeared in 1.14.2. This is how I reproduced it.
Get away from the spawnchunks, (/tp 1000 100 1000)
Place a single block in the air with nothing directly below or above it.
Place a carpet on the block.
While standing on the carpet, mark your coordinates, rounding down the y to the nearest integer.
Teleport back to spawn. (/tp 0 70 0)
Teleport back to the coordinates you marked (/tp 1000.5 100 1000.5)
You should see yourself falling below the block.
A couple additional things I have noticed are
If the carpet were removed, you would not fall
If the carpet were replaced by 2, 3, or 4 thin layers of snow such that standing on it makes y=integer+0.125 or +0.250 or +0.375, you would also fall through, but more than or equal to 5 layers of snow such that y=>integer+0.500 will teleport you to the right spot.
Even if the carpet is loaded by another player standing near it, you still fall through.
If you skipped step 5 and instead only walked a few blocks away, you would not fall through the carpet.
This is a big problem on my server with a lot of people falling into the void when trying to go to enderman farms. I would like to clarify that the above reproduction steps and comments were tested on my singleplayer vanilla server. I would appreciate a fix to this bug for 1.14.3.
Please check if that's still an issue for you in the latest 1.14.4 stable release or the latest 1.15 development snapshot.
I was able to reproduce on 1.14.4 but not on 1.15-pre1. I think it's fixed. Thanks for your hard work!
Some friends and I have a creative server and we are experiencing this a lot. Everybody is trying to be careful to be in Creative mode when teleporting now but even that isn't safe if you fall below the world. It's routine in 1.14.2 to fall a dozen meters or more because of the extremely slow chunk loading, which often puts us in a lava lake or the like. All of these teleports worked fine in 1.13. We can go through and rework all the teleport platforms to be bare stone but it's not very aesthetically pleasing.