Block Disappearing

One way to reproduce this:

• Hold an animal on a lead

• Place a block against a fence post

The block should place, but then disappear as it gets replaced by the lead knot.

U can also just stand next to blocks, jump and place one on top of them. It should vanish.

DONT try with valuable shulker box like I did...

Yes... yes... YES this happens very frequently, especially when you are placing a block downwards while sneaking. It's the most annoying bug in 1.1.
The problem seems to be related with subchunk border, I mean when you are around the border like Y=32, the chance of it happening significantly increases.
Never mind. Turned out it was a similar but a different bug. See MCPE-22836.

It appears that if an entities hitbox is moving within the space where you are placing a block, it the entity takes precedent and overwrites the block, which has also already left your inventory, losing the block forever.

Same provlem, win 10 1.1.4. Accidently placed a shelker box and it is GONE quite annoying as I had it full of bones and I only have three to begin with. Happens with all blocks not just shelker boxe

Update: placed a shelker box in the end no problems clicked to open and disapeares with all my extra hear.