Help with simultaneous audio output using wireplumber

[NaN]

Have you checked if your issue persists when using the lts kernel?

Here is how to switch to the lts kernel

Audio-Interface very often not recognized after boot

The first thing I would check is if changing the kernel solves this issue? I had weird audio crackling issue with zen kernel so wouldn’t be surprised if this issue is being caused due to zen kernel as well. First try the LTS kernel, sudo pacman -S linux-lts linux-lts-headers reboot and from grub boot menu → advanced options for garuda linux press enter. From there choose boot with linux-lts

If it works for you, you can set it as your default kernel using the garuda boot options software.