When I tamed my first horse in a new world, the notification of advancement called "Best Friends Forever" appeared as it normally appears. But also the notification of challenge complete called "A Complete Catalogue" appeared.
The "A Complete Catalogue" challenge is about tame all the cat variants.
MC-141871
"A Complete Catalogue" appeared when I tamed a horse.
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Juan Carlos Gudiño Aceves
(Unassigned)
Unconfirmed
Advancements, Challenge, Tame, horse
Minecraft 18w50a
Retrieved
Hello me as well its a bug of bad implementation of advencement.