Invisible horses does not show their saddles/armor, and invisible donkeys does not show their saddle/chest.

What it should happen:

Horses with invisible potion effect should show their armor/saddle, also with donkeys, but with their chest/saddle.

What it happened:

Invisible horses/donkeys didn't show their armor/saddle/chest.

How to reproduce:

1) Spawn a horse/donkey.
2) Tame it.
3) Give the horse an armor, saddle it... In the case of donkeys, chest it, saddle it...
3) Throw an invisibility splash potion near the horse/donkey.
... Profit! The full horse/donkey with its armor/saddle/chest are invisible.

Note: I think this is a bug. If this is a duplicate, I tried looking for this bug, but I couldn't find anything.