It is normal in Windows 11 when freshly installed. Now I learned that it happens for reset also.
Anyway, this is how it is in Windows 11. Even though the Microsoft Defender service is running, it is not active. It will update signatures daily via Windows Update and remain dormant. It won't use any CPU, only a few megabytes of ram. If Windows Security shows Avast as your real-time AV then everything is fine.