When placing a display block on the ground and placing any block or object next to it, it starts glitching and eventually turns dark. 

How to reproduce

Start by enabling cheats to run commands.

Then enter this command in chat:

/summon block_display ~ ~ ~ {teleport_duration:5,block_state:{Name:"minecraft:stone"}}

You will find a fake/display block place on the ground, then place blocks around the display block.

The block will start glitching and will turn dark.

Observations: Display block glitches and turns dark when blocks are placed around it.
Expectations: Nothing should happen and the block shouldn't glitch and change color.

Discovered while testing MC-270742.