Hello, today I found a bug in your game. Namely, when I want to feed the horse with wheat, sugar, apples, they disappear from the inventory and the horse has not eaten them at all. You can't breed horses because they simply don't eat. As previously mentioned, wheat and other items disappear from your inventory forever.
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Would MC-93825 happen to describe your issue?
according to the wiki (https://minecraft.fandom.com/wiki/Horse#Breeding), you can only breed horses with golden apples and golden carrots