Difference between 7-mode and Ontap 9 in security-style=mixed

I am comparing the environment between the old 7-mode ontap and the new Ontap 9 to be migrated.

In this environment, CIFS is used on the volume created with security-style=mixed.

I mounted the volume from Windows and opened the top directory property of the volume from Explorer. (qtree is not used.)

Looking at the Property Security tab, in the Ontap 9 environment, it seems that a user called "root(UNIXPermUid\root)" and ""root(UNIXPermGid\root)"" is registered.

However, in 7-mode, such users are not displayed.

Even in the environment of Ontap 9, if security-style=ntfs, it seems that such users will not be displayed.

In 7-mode and Ontap 9, Do the volumes created in security-style=mixed behave differently?

Or, is there merely a difference on the display, does not it affect the operation?