Wrong.
Go to read what is a beta in cycle of software.
These bugs arent of beta state, these bugs are before of pre-alpha, Indeed they are parts of the errors to be fixed in the development state, you dont realize what Is Camera Api broken and Banking apps broken. These type of errors arent of beta state, but they are of pre-pre-alpha.
And you again Need to understand this, they arent bugs of beta MIUI 12, they are bugs of modifications by Xiaomi.eu team, this mean that if MIUI 12 was stable you had the Same identical problems because xiaomi.eu team didnt test before to release and because they created these problems, no Xiaomi MIUI team, but xiaomi.eu team.
Also if is a beta, developers test always the software before to release to users...
The UAT that Is what se are doing now Is used to see others things, no these type of errors, and now i dont explain you the theory back.
Learn alone what Is a development cycle Life if you want..
The point of my critic Is not because there are these problems, the point Is that they didnt test before to release.
I hope Is clear now and Im Tired to repeat every time the same things.