Save Game / Cloud Kit | Crashes after Splash Screen

Yes, here too. It is reported as a known bug so there is no fix available.

Fix is scheduled for UE4.24 which will not come out before end of this year!
see here: Unreal Engine Issues and Bug Tracker (UE-75695)

Please dear fellow iOS Devs, if you need this feature, visit the link above and vote too for this issue to be solved.
This way Epic can be aware that more people rely on this.