Spotify Connect max volume when a web page asks for MediaDevices access

[PEZ]

I'm developing a feature for a web page where the users can record video and audio using the browser's MediaDevices API. When testing it on the same phone where my Spotify Connect client was running, playing musing on my Sonos speakers (two Sonos Move), the speakers started playing on full volume all of a sudden. It kept happening as I was testing the feature I am working on. It is totally unrelated to Spotify, just a web app. When this happens the volume control on the iPhone also goes to max, so I could lower the volume.

I actually don't need help with this. I'll play music from some other phone when testing my stuff. I mainly want to report this issue, since it is pretty awful when it happens. Thanks!