A recent Cerys update made it incompatible with Janus, and I couldn't find any info on whether they plan to resolve the incompatibility.

Yes, I do know about this. Janus was already optional in this mod, and was made optional in the full version of this mod for this reason.

It's up to the developer of Janus to update their mod to fix the incompatibility, I believe the issue is due to some script on their end removing or modifying vanilla prototypes which can't be fixed from another mod (something like that, I didn't ask for the specifics).

I'll be keeping it in the optional section of the description, just in case (though I have now updated the description of Janus to reflect the incompatibility, which I forgot to update)