Our PnP Root Driver creates both PDO and FDO, it should be only PDO

PnP Root Driver in Windows supports only PDO, and there are no functions in PnP root that are responsible for handling FDO.

To view useful DeviceTree, which has two viewing modes -
PnP View ( "P" - Root_ACPI_HAL_PnpView.png)
and
Driver View ( "D" - Root_ACPI_HAL_DriverView.png)

In the "P" mode at the top left the very first is Root Device Object (IopRootDriverObject (ENM)).
In the "D" mode on the left is the list of drivers (DRV) and their devices (DEV).

You can see that for "\Driver\PnpManager", all devices have a DO_BUS_ENUMERATED_DEVICE flag (which is set for each PDO).