I just installed iOS 14.0 and organised apps into folders on the Home Screen. After moving a widget (clock) to The home screen, some folders have disappeared and apps listed alphabetically at top level of Home Screen.
iPhone XS Max
Have a look at this one https://discussions.apple.com/thread/251814993
I recovered my iPhone X twice from a backup because of this "bug".
In my case ALL folders disappeared and the Apps (+100) were listed alphabetically.
In addition: I don´t act with the new feature (widgets) as long as an explanation is given.
Folders disappear from home screen
