This left me definitely confused with the way my save was playing out. It was acting as if I'd never even started the game since it locked me out of the co-op option. Going to post screenshots and it is technically fixed, but I'm hoping for this to not happen to other players since the only way I could fix this was via rollback.
#Anomalous save after completion
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Before I rollback just showcasing pics I took before rollback
Monastery safe zone gone where my cursor is
Exiles' cave locked
Quest I had completed behind the locked cave
Just showing co-op still locked as well
Strange safe zone tower bed not working even though it's activated
Safe zones not "completed" indicated by being whited out instead of green
Monastery featuring olivia and zombie that should be dead
Rope still there even though it isn't a safe zone
The first zombies in the monastery and door open again
closer look
shutting the door again just to check if the animation would play out
The first chimera's investigation prompt
doesn't summon it again (sadly)
that one zombie you kick at the top of the monastery
kicking it again
Town hall board not having the rest of the chimeras
and just to show I did beat the game
That's all I took before using the rollback feature fixed my save, had to beat the beast and the final boss again. Technically my issue was resolved (thank you support,) but it does mean there's a weird save bug that hasn't really been fixed since before the call of the beast events went live.