Vive Cosmos (no faceplate) + Vive Trackers in SteamVR while using OpenXR causes black screen on Cosmos in Unity

OpenXR
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When using OpenXR with SteamVR as the default system OpenXR runtime and using multiple SteamVR supported devices together e.g. Vive Cosmos and Vive Trackers/Oculus Quest and Vive Trackers, the play mode/headset view will be black with SteamVR reporting (with http added)

' CEF Local Resource Load Error: localhost:27062/app/image?app_key=system.generated.unity.exe&version=1.21.6 -> 404 (Not Found)'

See a video of this happening here, it is blocking me from working on a tool for using Vive trackers in OpenXR. I stress that this worked fine for me before I moved to using OpenXR, using OpenVR for this works totally fine but I want to support OpenXR for Vive trackers in Unity for my tool!

Also how to reproduce:

I have tested Vive Cosmos + Vive trackers and also Oculus Quest 2 + Vive trackers and both times I just get a black screen

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