I added an update that also checks additional_categories, so that may resolve your issue, but I could not personally reproduce this issue, and I see concrete mix successfully in the ai-trainer even without this change. Crushing Industry automatically changes recipes from "crafting" to "crafting-with-fluid" when it replaces concrete with concrete mix.
If the issue persists, then another mod is changing the category to "crafting" in data-final-fixes after CI, and that's a compatibility issue on that other mod's end, since I can't really do much from my end.