Android Question Settings are disappearing with State Manager and MIUI 12


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I am using State Manager v1.11 (without modifications) to save settings in my app. This has worked without any problems so far.
But now a customer has a Poco X3 NFC with MIUI 12.5.2 in use, where the settings disappear after some time. If you enter them again, it works for a while until the problem reappears. The customer replaced the smartphone with another device, but the error is still present.
It probably can't be due to Android 11, as the app works as it should on my Galaxy S10.

Does anyone have any idea what the problem could be? Unfortunately, I can't look on a non-rooted device to see if the "" file has been deleted.

Thanks in advance.