When teleporting into an unloaded chunk in 1.8, the player would fall while the chunk was loading, but be teleported back up by the game when the chunk loaded. This is not the case in the 1.9 snapshots.
To reproduce:
1) check your Y coordinate
2) while not flying, type this command: tp ~1000 ~ ~
3) as the chunk loads, you will fall down
I expected to be teleported to my original Y coordinate like in 1.8.
Instead I spawned in the stone under the surface and suffocated.
This is much easier to reproduce on a server with high ping.
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To reproduce:
1) check your y coordinate
2) while not flying, type this command: tp ~1000 ~ ~
3) as the chunk loads, you will fall down
I expected to be teleported to my original y coord like in 1.8 but instead I spawned in the stone under the surface.
I'd like to confirm this and provide a little more detail. Since the 1.9 update, many of my teleport commands (mainly command blocks) are teleporting players to coordinates that are 2-4 blocks lower than the command parameter. Repeated tests reveal the players fall after teleporting, which is what causes the drop.
The attached screenshots are from a teleporter that I had just set up; prior to taking the screenshots, it was putting me 2 below instead of 3. Old teleporters also exhibit this behavior, but not all of them. The behavior can occur no matter where the target is, but it seems more likely to occur on chunk boundaries. The distance below the surface seems directly related to how long it takes chunks to load.
Oh I was testing MC-89928 which involved teleporting to specific coords and kept ending up 5 or so blocks below my target. I was teleporting to underground locations while in creative but I would type, say, "/tp 6400 35 64" but fall to (6400, 31, 64) before or as the chunks loaded. To reproduce, perhaps try teleporting to a target location which is already underground, or being in creative? I'm guessing that, similarly to MC-89928 and MC-98153, server load increases the chance of this issue occuring as well as its severity as the chunks take longer to load.
Can anyone else reproduce this?