Windows displays a partition of inteal drive as a removable drive

I have a drive with three partitions: C: and G: and a hidden recovery partition. Windows recognizes the G: partition as a removable drive (judging by the icon). When I try to use the built-in backup tool, the drive is available only as a destination for the backup, not a source (backing up to a NAS).

How the drive appears: https://scr.hu/4vKPAk

Screenshot from partition manager: https://scr.hu/L7n2Ja

Screenshots from Windows Backup:

https://scr.hu/pPYVGY

https://scr.hu/2KYylj

The computer was upgraded from Windows 7 Home to Windows 10 Home in order to be able to backup to a network location. The same icon appeared in Windows 7. I don't remember when the icon appeared.

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