You can duplicate horse armor by killing the horse

*Verification builds: *
1.11.4

Summary:

When killing a horse, it can drop 2 horse armors

Steps to Reproduce:

1. Tame and equip a horse with armor
2. Kill the horse

Observed Results:
An additional horse armor drops when it is killed

Expected Results:
Only one horse armor should drop

Screenshots/Videos attached:
https://youtu.be/rFjiDtYo0fI
Yes

Notes:

Original report in Russian:

Когда я убил коня в алмазной броне, выпало не одна броня а две. Исправте этот баг с Дюком лошадиной брони.