Ever since the update to 6.12.18 my lone AMD-based Qubes system (others are all Intel) doesn't shut down when told to (restarts so that I must power it off manually)

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Not sure that anyone has commented upon this one yet.

Addendum:

I tested just now & with the older boot kernels so I can confirm that the 6.6.77 one (if you boot with it instead of 6.12.18) works normally on this system.