Killing falling_block entity: texture disappears while falling but the block is still there

The bug

When you have a repeating command block (command: kill @e[type=falling_block]) and you let an anvil (sand/gravel/dragon egg) fall on the ground it doesn't fall, only the texture disappears. So it is still there as a ghost block (you can't walk through). When you update the anvil by placing a block where the anvil was before it appears, floating in the air.

Code analysis

Code analysis by Marcono1234 can be found in this comment.