Most rideable mobs (Donkey, Horse, Llama, Mule, Pig, Strider) will drop two of each wearable.

Most rideable mobs (Donkey, Horse, Llama, Mule, Pig, Strider) will drop two of each wearable.

What's worse is that this also duplicates items in the inventory of a Donkey, which is my reason for creating a private issue.
 

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Reproduction Steps

• Tame a rideable (Donkey, Horse, Llama, Mule).
• Give the rideable any/all wearable(s) (Horse Armor, Saddle, Carpet, items in the inventory of a Donkey).
• Kill the rideable.