Creating new user resets configuration address to /32

[egorshulga]

Describe The Problem A clear and concise description of what the bug is.

I had this configuration:

[Interface]
Address = 10.100.0.1/24
SaveConfig = true
PostUp = ...
PostDown = ...
ListenPort = 51000

When I create a new user via the dashboard, then the Address in the configuration is reset to 10.100.0.1/32. In its turn, it breaks the discovery of available IP addresses for new users that I create afterwards.