I don't know how long this has been going on but I realized that my microphone was working despite the fact that I had blocked it.
I called a friend and realized that they could hear me before I clicked allow microphone access on the prompt that came up when an app tries to use the microphone.
I tried this several times and ensured that microphone access was blocked in the settings.
This only occurs with the default phone dialer. I've tried this with signal and whatsapp and with those it works as intended.
For reference I have a google pixel 8 pro running the latest stable build. I also only have one profile on the device. I've rebooted the device several times but this bug persists.