No calls when Simple Dialer is the default dialer

[muxina-credo]

When I set Simple Dialer as the default dialer I can't initialize any call. The screen just prompts the number I'm calling and nothing happens.

It is odd because I was using this app some versions ago (around December) and it worked fine. I've tried downgrading to older version but it fails with an unknown error.

I'm running version 5.17.3 on Android 11. My phone is a Moto E32.