[MC-28] Zombies glitching through sand

Ive saw skeletons and zombies do it so far?
i spawned a few in then let them walk of but some just started falling in the sand its like when it happened with the wooden floor when they fell through that.

Related issues

duplicates

MC-119 Mobs visually sinking through solid blocks

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migrated 2012-10-24T14:53:32Z

[media]

migrated 2012-10-24T17:53:15Z

this happens to all of the mobs and is a really big issue. it also happens with other blocks

migrated 2012-10-24T18:09:37Z

Wasn't this fixed in 1.4.1pre? I'm spawning zombies like crazy on sand and wood in 1.4.2pre, but I can't get them to glitch through the floor any more.

migrated 2012-10-26T17:52:17Z

I have seen this happen, but not to zombies. I am seeing that chickens, particularly when jumping, will glitch through sand. Maybe it's something when mobs jump up a block?