fetchSavedGamesWithCompletionHandler not working on iOS 14

iOS 14 devices are not able fetch games saved on, previous iOS versions (tested with iOS 13 and 12), no matter how much you wait or how many times you try, or even if you restart the device.
Tested more than 20 times, it simply doesn't work. It works the other way around, games saved on iOS 12 and 13 are fetched without problems among them and on iOS 14.

By the way the app container in device (iCloud settings>Storage management) appears, and even shows the size of the save file. But still, it won't fetch.

Anybody else?