Back when Redfish was first released, the usage of power state was fairly limited, so Chassis and ComputerSystem had their own enum for it. However, now that that data model has grown to support various power equipment (like rack PDUs), several new resources have been added that also needed a power state. At that time we made a common PowerState enum, but haven't seen the need to redirect Chassis and ComputerSystem to use the common enum.
Thanks for your answer, but I found that "Pause" Reset Type was added in Resource v1.13. And description of "Pause" is: "This value shall indicate the resource will transition to a paused state. Upon successful completion, the PowerState property, if supported, shall contain the value `Paused`.",
Then I checked ComputerSystem v1.18 and "Pasued" is not listed in the enum list of PowerState. So I think the ComputerSystem/Chassis schema need to be updated for this, right?