Random chance... we get posts like this every week or so. You hit a dry spell and attribute it to some bug. Just keep playing.
I don't really understand what do you mean by dry spell. Regardless, that's what I do: keep playing (the last 15 levels or so).
I'm lvl 31 btw. So, you wanna say that I was so unlucky and didn't find any antlers through 15 levels of strait playing without power leveling? I don't think so. Otherwise I'll be grateful if the proofs of this bug not being an actual bug and just shear unluckiness were provided.
Nothing in the patches so far would effect ingredients.
Ok. However it doesn't change the fact that the problem exists and seems like a bug, because I saw similar problems posted here before.