Horse Armor Duplication Glitch

When killing a horse wearing horse armor with a looting sword, the horse armor has a chance to drop twice.

Steps to reproduce:
1. Enchant a sword with looting. Looting 3 will make the glitch msot likely to happen
2. Tame a horse
3. Equip the horse with any kind of horse armor
4. Kill the horse with the enchanted sword
5. You may need to do steps 2-4 multiple times

Expected Results:
The horse drops a single piece of horse armor, and a saddle if they are wearing one

Actual Results:
The horse sometimes drops 2 pieces of horse armor instead of only one