The auto hammer doesn't accept any of the 3 stone variants (Diorite, Granite, Andesite) that outputs crushed stone versions.
Note:
These crushed stone versions were just added by Ex Nihilo in latest builds
.
Forge:
1.12.2 - 14.23.4.2708
ExCompressum_1.12.2-3.0.22
exnihilocreatio-1.12-0.2.2

HammerRecipes JSON:
https://gist.github.com/knoxhack/41bf59edb670b4a146db0628405556e2