I tamed a horse and got the advancement for taming all 10 cat variants.

I tamed a horse and got the advancement for taming all 10 cat variants.

What I expected to happen was...:
I just expected it to tame a horse.
What actually happened was...:

I got the advancement " A complete catalogue "

Steps to Reproduce:
1. Tame a horse in minecraft.
(thats all)