jelicicm mentioned ubuntu in the original comment. I seem to remember that as of Ubuntu 20.04, LDAC wasn't supported. I needed to jump through some hoops to get

jelicicm mentioned ubuntu in the original comment. I seem to remember that as of Ubuntu 20.04, LDAC wasn't supported. I needed to jump through some hoops to get it to work. It was still using full-on pulseaudio, not pipewire, at the time. I wouldn't be surprised for it to still not support non-free codecs out of the box. I've indeed had no issues on my Arch install. Works perfectly with LDAC on my Sony headphones and aptx-hd on my Shure. The mic of the Sony is a bad joke so I never use it, but I've tried it and switching modes worked fine on Linux.