In the video shown, i was attempting to break a block with both soul speed 3 on my boots and a speed 2 beacon in range. I was targeting the already broken block, but the highlight was appearing on a different, unbroken block. When attempting to continuously break the block, it allowed me to as if I was targeting the highlighted block, but behaved as if i was targeting the empty space instead.

NOTE: I have not tested if this effect is directional.

Steps to reproduce:

1) equip boots with soul speed 3
2) give yourself the Speed 2 status effect.
3) attempt to break a block

Expected outcome:
The targeted block is highlighted and broken

Observed outcome:
A differently block is highlighted, but the game attempts to break the space that is being targeted.