[GS] A great work disappeared, possible to find out where it goes ?

[Ondolindë]

No, it's not a mod issue.

I don't use mods myself and I've encountered this problem before (many times and throughout the history of the game).

And have you reported it? If you have actual before and after saves, then I’m sure Firaxis will look at it. They do that all the time in the Bug Report Thread.