Let me tell you
1 - YouTube VR is not supported in Android 10 (ONEUI 2.0) even in the official build. But it was working fine on Pie.
2- try to switch between recent apps by swiping up and slide. they flicker. I have attached a clip. Check.
3- Camera quality is drastically reduced. Auto focus is not working properly.
4- Stereo Speaker Sound really bad
5- sometimes phone freeze.
6- really bad battery backup.
7- Pip mode is not working. When you interact with the other apps the video playing in the pip mode stop for a second.
8- android 10 gestures are not working with custom Launcher. But Google has fixed this issue in stable android 10.
9 - 5-6 second delay in incoming calls.
10- ram management is not good as it was in pie.
11- even in the android 10 ( Oneui 2.0) it still doesn't show Bluetooth battery level in the notification bar.
12 - Fingerprint unlock is very slow. Face unlock doesn't work properly and iris scanner is worst.
13- abnormal charging speed.
I think you should do a reset, I just updated mine via adb, and the performance is flawless, I thought the last beta was great but the DSLB feels more polished and more of a proper daily driver. Anyway, just wanted to share my experience.