Entities Rendering

Entities Rendering problems

I was going to place a item frame to decorate my mob trap

The item frame rendered with no problems but all the other entities and dropped itens were flashing (getting invible and going back), but when i remove the item frame them get normal again.

Steps to Reproduce:
1. Create a world
2. Open it
3. Place a item frame on any block
4. Summon mobs
5. And observe them