S95D randomly doesn’t allow passthrough audio anymore (Sonos soundbar)

Hey guys, so I’m using a S95D with a Sonos beam connected as recommended via the HDMI eARC. I set the format for digital output to „passthrough“ since this offers the best quality. The Sonos app shows the audio format when something is playing on the TV.

Today I noticed that the Sonos app showed an new format called „Dolby multichannel PCM 5.1“ at Amazon, YouTube showed „pcm stereo“. Before it alway was Dolby digital 2.0.

I’ve checked the sound settings and for some reason the passthrough option was greyed out and not available anymore. Only options now are auto and pcm, auto was selected when I checked and is still selected.

Anyone familiar with this issue? I’m not quite sure if it’s on the tv or the Sonos end what is causing it but I figured TV seems more likely.