I don't know what to call it. But it's some kind of invisible summing of block thing, where when they get stacked on each other, the top 1 becomes invisible.
See This Video: https://www.youtube.com/watch?v=yM8uT-isGis
(I Did it with creepers cause I felt like it, you can use this command too: )
/summon FallingSand ~3 ~2 ~ {Time:1,Block:"stone"}summon it until it has reached the top of stack, then summon 1 more time, the block will drop, but the next block will be invisible.
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When you summon FallingSand into a block, the FallingSand is destroyed, but the block becomes invisible. It damages mobs and Players because it stills there, but you cannot see it. If you reopen the map or place another block in the same place, the block is correctly seen.
The bug is somewhat fixed in 1.8-pre1. If you use the command from the description of the bug, the first time the entity is inside the block, the second time it starts suffocating, and the third time the falling sand doesn't appear (though the first two don't disappear).
Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases. If this has been done, we can reopen the issue.
Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. We will reopen it as soon as the requested information has been delivered.
I've also experienced this bug (I was in 14w21b). I think it could be caused because of a wrong/early conversion of FallingSand into block.
The block won't render until it's updated again, but stills hurting the Creeper.
If you reload the map, the block will appear. Also, with McEdit, you can see that there's a block.