In latest ROM 9.11.7 (at least on Mi 9T) if you used to have V4A working you have to rename file /vendor/etc/audio_effects.conf prior to driver reinstall after first reboot.
Same for Mi 9T/K20, freezes and needed to force reboot with power button. If this is Xiaomi bug, is any way to rollback to last working ROM withouth clean re-install?