Blocks that occupy the same space as players don't attempt to push you off edges

The Bug

If a block falls on top of you, and it pushes you away, it will not push you completely out of the block when sneaking. This has a small effect on normal gameplay, but a very large effect on multiplayer servers.

Steps to Reproduce

• Build the setup as shown in the attachment below. setup.png
• Stand on top of the diamond block and begin sneaking.
• Break the stone block that's supporting the sand, and once the sand lands on top of you, wait for it to stop attempting to push you out of the way.

Observed Behavior

Blocks that occupy the same space as players don't attempt to push you off edges whilst sneaking.

Expected Behavior

Blocks that occupy the same space as players would push you off edges whilst sneaking.