UID 0 - parralles claims that two users with that uid exist. Can't install version 13.

[Piotr3]

Got error like described here :
https://kb.parallels.com/eu/122763

but users with UID 0 are only:
dscl . -list /Users UniqueID
/ 0
root 0

Mac version: 10.13.5 (17F77)
Was trying to install parralles 13. Version 11 is running without issues.

 

[rkulikov]

What is the reason of having user "/" with UID 0 in the system?