Block Highlight Glitch (z-fighting)

When you look straight down at the ground while walking when Split-Touch Controls are turned on, the block highlight "z-fights" the block. (This bug also works without Split-Touch controls)

Expectation:
For the block to be completely highlighted

What happened:
The highlight is "z-fighting" the block

Steps:
1. Turn on Split-Touch controls (it also works without it, but it's more visible when turned on)
2. Look straight down at the ground
3. Start walking and look carefully at the block highlight.