Latest version of PipeWire 0.3.70 is available in all Manjaro branches
packages.manjaro.org/pipewire
Seems Manjaro team is now maintaining (and fasttracking) PipeWire packages rather than inheriting from Arch
If PipeWire is still not working as expected, start a new topic
See this topic for testing of latest release-candidate — [Call for Testers] Manjaro 22.1.0 Talos