There is also a discussion about this question. Maybe there will be an answer there. Good luck all of us with this https://experienceleaguecommunities.adobe.com/t5/adobe-analytics-questions/mobile-device-going-into-unknown-generic-android-mobile/m-p/604041#M44451

It is surprising that only this thread can be found in Google search.Have you come across official information from Adobe about whether they will fix this issue globally?