The bug

Shulker boxes create dark spots on block They stand on, and it can be seen from far away when shulker boxes are not rendered.

How to reproduce

1. Create a 10x10 wall (for better view)
2. Place on it shulker boxes (on 1 side)
3. Go far away
   → The wall is black from the shadow of shulker boxes, but you don't see the shulker boxes.