If it's a bug, I'm willing to bet the organizers would let you do an update?
I don't know which OpenXR reference space you used (it's a project setting), but it's easier to control where the player will start relative to the XROrigin3D if you use the "Local Floor" reference space. The "Stage" reference space (the default) can be a little unpredictable, because the XROrigin3D is placed at the center of your play space according to your headset, and it can sometimes decide that sort of weirdly :-)