End crystals appear black.  Fill an end crystal with sand. make sure to leave some out. You will see that it is black. see video.
The End Crystal doesn't render when at the top of the screen.

How to Reproduce.

• Summon and End Crystal.
• Fill the space it is in with blocks (see pictures).
• Make sure you have filled in the block the End Crystal occupies with sand or gravel.
• Notice how it it totally black.

What Happened.

• If you fill in the space the 'End Crystal' occupies with a block, it renders total black.

What I expected would happen.

• It would just be partly covered by blocks while still retaining it's color on the outside of the block.