VENUS Mi 11 here, Google Phone dialer has issues on the latest stable version, worked fine for Android 12. Issue: doesn't show up on screen locked (there is ringtone). On unlocked screen it shows up sometimes as a small bubble at the top, sometimes normally and sometimes just sound and nothing else. Basically it's all over the place, worked before and now doesn't. Is it fault of Google? I doubt so, they put a lot of work into their apps and Android system after all, it's been well tested for months. Could be issue on Xiaomi side? Maybe, can't tell.
PS I did check the permissions and looks like the app has all required ones, I did unlock extra two but I think they're not necessary.