Blocks/items held by witches are flipped upside-down

The bug

Blocks held by witches are upside-down. Assuming that it uses the same rendering methods used for players I would expect all items to be displayed correctly.

How to reproduce

1. Use the following command:

   /setblock ~ ~ ~ repeating_command_block{Command:"/data merge entity @e[type=witch,limit=1] {HandItems:[{id:\"tnt\",Count:1b}]}",auto:1b} replace

2. Spawn a Witch