Actually, this is a somewhat general phenomenon. Consider for example, the version of Newcomb's problem where the box is full "if and only if UDT one-boxes in this scenario".

UDT's optimality theorem requires the in the counterfactual where it is replaced by a different decision theory that all of the "you"'s referenced in the scenario remain "you" rather than "UDT". In the latter counterfactual CDT provably wins. The fact that UDT wins these scenarios is an artifact of how you are constructing your scenarios.