Ghost Slimeblock

Put the summary of the bug you're having here

What I expected to happen was...:
I thought it would just normally let me destroy all of the Blocks.

What actually happened was...:
I was just messing around with some things of the new Snapshots when i found this out.

Steps to Reproduce:
1. In Survival, build a Pole of at least 5 slimeblocks.
2. Step on top of it and hold the mouse down to destroy them all.
3. You destroyed all of them but theres still a ghost-slimeblock where the block closest to the ground should be.