Translucent chests.

Ive gotten this on two different computers, so im guessing its a bug. But when i look a certain direction at a chest, it becomes translucent.

Also shown on this reddit post:
https://www.reddit.com/r/Minecraft/comments/3tcf2m/my_chests_turned_transparent_15w47a/

Edit: This bug appears to be a duplicate of bug MC-92906.