Vibrant Visuals: Shadows have diagonal lines sometimes

I am not using any add-ons or resource packs

Relates to: MCPE-216741 MCPE-217248

Reproduction Steps:
- Create a world with seed 8566450905628078163
- Tp to -630 64 46
- Run command /fill -617 63 50 -614 63 43 stone
- Set time to 0

Observed Results:
- Diagonal lines can be observed

Expected Results:
- There would be no diagonal lines