I played ratchet and clank PS5 on my Sonos arc+sub gen 3 + 2 one sl ....sound output was 5.1 channel Dolby surround sound .....in PS5 sound settings i had choosen Dolby and soundbar output if i remember correctly....
When I had choosen 3D audio...i was getting linear PCM stereo output....
Right now PS5 can only give Dolby digital 5.1 ...