On the final page in the properties dialog (Routing), there is an option "Only use the VPN connection for these addresses". Setting these influences the output, which in my case looks like this
X-NM-Routes=10.7.0.0/24
Use-Routes=yes
These aren't set in your file, as above. Set this to reflect only the networks you wish to route to, and your problem will go away.
On the final page in the properties dialog (Routing), there is an option "Only use the VPN connection for these addresses". Setting these influences the output, which in my case looks like this
X-NM-Routes= 10.7.0. 0/24
Use-Routes=yes
These aren't set in your file, as above. Set this to reflect only the networks you wish to route to, and your problem will go away.