Windowds 2012r2 Forwarding disappears when 3G connection modem is turned on, what should I do?

Question

System administration

Good afternoon experts.
there is such a stand:

On the forwarding host, set up the command:
netsh interface ipv4 set interface WAN forwarding=enabled
where Wan is the name of the 150 interface.
Until a 3g connection is established, forwarding works correctly. From the VM, packets fly to the Internet (And if you make forwarding=disabled, then they stop flying).
But if a connection is established via 3g forwarding, it immediately stops working.
The 3g connection has a checkbox "Allow other network users to use the Internet connection ....."
Tell me where to dig? So that when establishing a 3g connection, traffic from the VM goes through the modem?

Answer 1

https://answers.microsoft.com/en-us/windows/forum/...
Question removed. There are only mats in my head.

Answer 2

You get 2 gateways on the host, with this connection.
Alt additional parameters (screen attached). Can I change the priority of network devices here?