Leads attached to donkeys and mules connect to the same place as on the horse, even though they are shorter. It's not really an issue except for when the donkey or mule bends it head down to eat, but when that happens, it's very noticeable.
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Duplicate of MC-14395

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We're tracking this issue in MC-14395, so this ticket is being resolved and linked as a duplicate.
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tested this, can confirm that this happens