Passthrough broken in latest Link v81 Update (Unity)

This morning I got an update in the Quest Link desktop app (v81), which seems to have broken Passthrough when playing from the Unity Editor (Meta XR v78). It looks like this inside the headset:

I've tried re-installing the Link app, and rebooting both the Quest and PC with no luck.

Anyone have an idea what could be going on? Is it somehow possible to downgrade to the previous version?

Versions:

Quest 3 v81.1034

Quest Link app v81.0.0.828.254

Unity 6000.1.8f1

Meta XR packages v78.0.0