If you light a block of TNT and then reload the map (exit to menu then go back), it will appear to sink one block into the floor.
The TNT must be on the ground before leaving the game.
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What? It has nothing to do with end portals.

Drop TNT into the End. Enter the end - same as reloading a world. TNT is in the floor.

I thought the end portal issue was a teleport offset error.

Ok, it's not quite the same, reopened.

It's probably related to MC-119, but this is triggered by a world reload and happens every time.

Confirmed.

Is this still a concern in the latest Minecraft version 14w08a? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

It appears to have been fixed with 14w08a from what I can tell.
Duplicate of MC-1918.