Error while updating custom security role

Hi All,

I have copied the system Administrator and trying remove some Security Role related privileges from this new custom role, but getting the below error when saving it.

System.ServiceModel.FaultException`1[Microsoft.Xrm.Sdk.OrganizationServiceFault]: Privilege a8c424c8-5e57-40d0-bdc9-4b00f65f3e34 is duplicated. (Fault Detail is equal to Exception details:
ErrorCode: 0x8004140F
Message: Privilege a8c424c8-5e57-40d0-bdc9-4b00f65f3e34 is duplicated.
TimeStamp: 2023-06-05T14:27:43.5651635Z).