Only happens while having enchanted equipment and not holding any item.
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Can confirm.
This issue relates to MC-98327 / MC-93532 / MC-93503.
⚠️ Notes:
It occurs only in wearing enchant equipment. Screenshot 1
Holding a items can be restored. Screenshot 2
Confirmed for 1.9.1-pre2 / 1.9.1-pre3
Confirmed for 1.9.1 / 1.9.2

Only occurs when no item in hand for me.

can also confirm .. i mean it looks not bad but i think its a bug

I can confirm.

Please include the version you can confirm it for in your comment
Confirmed for 16w15b
Confirmed for 1.9.3-pre3
Confirmed for 1.10-pre1.
Confirmed for 1.10.
Confirmed for 1.10.1.

Confirmed for 1.10.2.

Confirmed for 1.10.2 and 16w36a 1.11 snapshot.

Confirmed in 16w40a

Confirmed in 16w41a

Confirmed in 16w42a

Because a bug is a bug, if something is clearly not intended it's a bug and should be reported!