Whoops, I'm sorry, I just reread your message, you asked for the saved game files, so here they are, all for the same game. Due to the constant desyncs, I set it to autosave after every turn. I do not know if that runs the risk of saving the problem into the game or if they always happen after a save. This is still an active game we are playing, I can send upload a the most recent save the next time it happens, if that would be helpful.
In the mean times, here are the save files. If you have questions, feel free to ask, I'm happy to help troubleshoot/experiment etc.
https://drive.google.com/file/d/11kQ47T1I8zlw-GvKQjBhmk3Gl6_CN63v/view?usp=drive_link
Adam