Saved data from cloud backup is not restored.

Customers have reported that saved data from backups are not restored when reinstalling the app.
There have been two reports of saves being initialized after failing to update the app and trying to initialize it.
For one of them, we have conducted a hearing and confirmed from the link that the backup data seems to remain.
We have also confirmed that backups are enabled.

Are there any conditions under which the backup data will be restored when the application is reinstalled?