Bug found when taming a horse
What I expected to happen was...:
I expected this to happen: Only getting the [Best Friends Forever] advancement.
What actually happened was...:
I got 2 advancements, [Best Friend Forever] and SURPRISINGLY [A Complete Catalogue].
Steps to Reproduce:
1. Tame A Horse
Tada! Now You Have [A Complete Catalogue]...
Not Sure Why This Happened AT ALL.