Missing `remote-inbound-rtp` stat in Firefox when sending audio track

[streamer45]

Your environment.

• Version: v0.1.11
• Browser: Firefox 108

What did you do?

Sending a single audio track from Firefox to pion webrtc, acting as SFU. It's also reproducible with the basic broadcast example.

What did you expect?

I'd expect a remote-inbound-rtp stat to be available on the client.

What happened?

Only the outbound-rtp stat is available.

Other facts

• This works nicely on Chrome where the remote-inbound-rtp stat is correctly returned.
• Publishing a video track works as expected and correctly generates the stat report, even on Firefox.
• Doing a simple peer-to-peer test on Firefox and sharing a single audio track correctly generates the missing stat.

I agree that on first looks it almost seems like a Firefox issue but just wanted to double check with some experts here in case there's anything that could be done.

[streamer45]

I did some quick bisecting and it seems that this has stopped working in Firefox 96 so something must have changed on that side, just not sure what exactly.