DB4 so far has no issues : youtube has no constant freezing, calls now all are able to go through. However there is one issue on the app called "edison". it is a mail app and sometimes when i swipe back to home and go back to the app it will come out as a very small and unusable screen. but you can just shut down the app and reopen it and everything is normal

other bugs i found is the xiaomi home app. don't know if it is a ios 13 problem (as it was working fine on iOS12), the UI and interface is very out of place. as you can see the in the picture the text and icons are out of place. nothing wrong with the usage but it looks very weird

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