MRUK 77.0 LoadSceneFromDevice() Doesn't Work

I just updated my MRUK package from 69 to 77, and now MRUK.LoadSceneFromDevice() doesn't work. It instead logs an error:

Error Unity [XR] [OpenXR Meta] xrLocateSpace failed with result XR_ERROR_HANDLE_INVALID
Error Unity [XR] [OpenXR Meta] [AnchorProvider] xrLocateSpace request failed with error: XR_ERROR_HANDLE_INVALID

I am using the Meta OpenXR plugin.

Note that the MRUK MonoBehaviour's checkbox "Load Scene On Startup" does still work. But the problem with this fallback is after my app launches Space Setup and the user completes it, then returns to my app, the new room the user created will not be available. So the user will have to restart my app.