Can't get audio to work on Linux

[MrMinimal]

First of all: thank you for this project, a lot of people could use a good VOIP implementation for Godot.
This would be perfect for my multiplayer flight simulation.

Problem
When transmitting my voice, I get a cracking sound as shown in this video:
example.zip

System
Kubuntu 20.04 64 bit
Godot 3.1 (and tested on 3.2)
PulseAudio

Did you test this on Linux or was this developed using Windows/MacOS?

Thank you in advance!

[MrMinimal]

Closing as this has to be fixed by Godot itself
godotengine/godot#33184