The bug
When you break a block, the breaking animation is upside down.
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Comments 4

Hmm, not really. Related, but not the same issue.
Can confirm. The animation always appears to be upside-down. Also, sometimes it's flipped, but I don't know whether that was the case previously as well. I've attached a resource pack with which the issue is easily reproducible. Black is supposed to be on top, green on the left, blue on the right, and red on the bottom.

Duplicate of MC-162611
Duplicate of MC-163045