Shulker Boxes Act Strange With Certain Blocks On Top Of Them

Certain blocks disappear or vanish partially when placed on a shulker box, and opening that shulker box.

 

Steps to reproduce:

1. Place a Redstone Dust on a shulker box.
2. Open that shulker box.
3. Notice how the redstone dust disappears, then reappears.

This also works with pressure plates, levers, buttons, and probably others.