I have found the same bug from the older version, in the newest version. I have some screenshots of what happens:
The order of events for the above photos:
1: Game Menu
2: Save menu with the save Thunderclan day 5 selected and the mouse on the overwrite button
3:Clicking the overwrite button
5: Nothing happens, just selects the top save.
Order of events for the above 2:
1: Select new save (the top save says Thunderclan day 4 9:35am)
2: Nothing happened, everything is the same and no new save appeared.
If you have a solution it would be greatly appreciated, sorry for the load of pictures, just thought to show what happened.