This is a known design limitation of the Orion XS. I reported the same deficiency here last here: Orion XS not charging - #9 by silvercreek
The solution in my mind is to update the firmware to add a toggle for whether the Orion participates in DVCC or not. That way, we could connect the Orion for monitoring from Cerbo or VRM without DVCC getting confused about which battery it’s charging.