Not a fanboy of standby energy testing, just something I tested.
If you wondering what made me test it, is that I noticed the external hdd connected to it a usb port was still powered on and active, even when it was configured to be powered down when in standby, so I knew something wasnt right from that alone. Also take a look at reddit there is bug reports on this out there.
What I meant is are you using a plug-in energy meter, or your IHD to measure energy usage? I've no idea how the Xbox does things but the PS5 continues supplying power to external drives, USB ports etc unless you specifically set it not to, but if other people are reporting bugs then that's a whole other issue.