Smart Switch reinstalls app data, and allegedly this could be a problem (Android 10 app data not "running" properly on Android 11 app). I do think that this can make a difference, because I've had issues before with Smart Switch, which I believe will batch restore most data. As an alternative, you can be selective about what you restore, thus minimizing this potential issue. Take this with a grain of salt. It would be nice to get the opinion of a dev or someone that writes code.
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