You can remove (or move to /sdcard) some application you don't need from /system/priv-app, "Weather" app for example. Then flash BootFix again.
It worked for me.
Now I notice that too. At the same time, RAM leaks (about 1.5GB free after cleaning), the launcher restarts, I can't switch between apps and cleaning RAM does not help.
The most awful build I ever used.
I confirm these bugs on mi 9t pro. They broke media notifications. Better stay at 12.0.6.0. I regretted that I updated.
Great "Stable" ROM. Classic Xiaomi.