Ignoring a user setting for audio output is a serious breach of expectations for the behavior of any software, and it should have prompted a patch release with a fix within a couple of days at most. The fact the bug is still unfixed after 3 weeks of being reported tells you 1) they’re seriously incompetent, or 2) their processes are seriously broken. Or both.
What’s worse, the suggestion that the problem should be mitigated by setting the sound output of the whole device to zero is simply scandalous. Your app is just that: an app, and has no jurisdiction over what I do with the rest of the OS/device, something Zwift is happy to break here, just like they do in the behavior of the full-screen app on a secondary display, as many users have reported over time.
Not just the expansion. Think of all the new users and engagement that the Mark Cavendish activities will bring. And I bet the Cav contract is much more expensive than a few days worth of testing, which shows you what their priorities are.