Switching call to headset or mobile device from Poly Edge e350 results in muted microphone

We use Poly Edge e350 phones (current firmware 8.5.0.1491) as our primary device for Zoom Phone.  We have noticed that if we answer a call on our Poly Edge e350 and then use the “Switch” feature to move that call to either a headset on a Zoom Workplace PC or a mobile device, then microphone audio is muted.  You can still hear the person on the other end, but they can no longer hear you.  We have a ticket open with Zoom on this, but they haven’t made much progress.  I’m wondering if anyone else using Poly Edge e350 devices (or other Poly Edge models) is experiencing this issue or can replicate it?  We think the problem has existed for several months, but no one reported it because it felt like a one-off issue.  But once we started investigating and figured out the parameters, we can reproduce the issue 100% of the time.