I had issues with my mics on pipewire 0.3.35, too.
Downgraded to 0.3.34 and that fixed it for me. Only a temporary solution, but works.
Explained it here:
https://forum.manjaro.org/t/obs-stopped-recognizing-input-audio-devices-after-sep-16-stable-update/83305/2?u=sashage