[3.1dev] Subdomain (vhost) - Domain added to host each save

I am using latest 3.1dev (git-stable) and there seems to be a problem when you edit a Subdomain (vhost) entry. Each time you save the entry the domain will be added to the "HOST" field.

Example

Host = mail Domain = [dropdown] example.de

First save = mail.example.de Second save = mail.example.de.example.de