I cannot say that practises of cannibalism were allowed in any century though I imagine it was not policed as heavily in some remote regions of Vallo.
But! To answer your question, it is safe to assume, yes. Worlds are not meant to touch one another in the way that this seems to have happened. An unfortunate mistake, I assure you! Therefore what you are experiencing is likely an extreme case of duality of singularity—the sharing of two in one. Perhaps. This is all conjecture, mind you.
And there is so much I would like to know and not nearly enough time. It seems food though is a welcome opportunity that we can all share for a common ground. Your favorite food?