Let me rephrase that, Celeste can't be knocked out between the time of meeting Malayna in camp Akateko and the time she becomes a permanent party member. Before that point her reputation should be too low to trigger the revenge effect.
From what I have been able to gather, it won't retroactively fix old saves. Just prevent new ones. I tried making a special encounter that was supposed to reset character statuses to a clean slate but that didn't work.
Sadly, the battle engine used for the game is rather buggy, and the coder who wrote it has been inactive for close to 8 years. I managed to patch out a few of the bugs with help from a friend who understood the language but even he couldn't figure this particular issue out.
This said, my artist is finishing up the last images and should be sending them to me this evening. hopefully that is when I can make the hopefully final release! As far as I can tell all the bugs people have reported so far should be gone
Okay, that's understandable. At worst, then, saves prior to Akateko should be okay; saves between Akateko and the Tower of Revelation are questionable. But in my case they're almost certainly corrupt because I'm playing on Hard and people drop pretty regularly. I'll have to see if I have an older one. I'll post back once I've confirmed the fix works for us.
Thanks for the work you put into this!