Alas, I use little saves. So no save with Tidefall in inventory. If I had know there were this kind of bugs, I would have made more save, sorry.
But I was just asking myself, normally, an object must be present somewhere in the saves ? In a scene, in inventory ? Don't you have the tools to examine the saves ?
I've tried but I found the saves are a serialization of the content, and I don't know wich library I could use to deserialize the saves.