bug#35902: Guix resets passwords on reconfigure

[Marlon]

My user and root passwords have been reset about 3 times in 4 days upon running 
guix system reconfigure.

I can't seem to recognize any pattern, it appears to occur randomly, and it 
requires setting passwords manually. 

The password is left blank, and could be a security issue, as anybody would be 
able to access the root account easily.