Minecraft Window made not active while funilly enough I was submitting a different bug report about chicken eggs, and when I came back to Minecraft thus making the window active again, all the chickens lost their textures and all you could see was their shadows moving around. They still dropped eggs; which were visible. Player could still interact with them, and when killed they still dropped loot, which were also visible. My video exceeds minimum size able to upload so at the bottom of this text there is a link to the video in my Google Drive. Saving and quitting the game restores their texture,

https://drive.google.com/file/d/14HJdHDdz2-WYMYpPpvibEZGo4XpR8UVs/view?usp=sharing