Does your VPN share a CIDR with your LAN and not use the right gateway? This ansible playbook works to resolve on OSX.

fix-laptop-gateway.yaml

---
- name: Add a network route
  hosts: localhost
  become: yes

  tasks:
    - name: Drop any existing network route
      shell: route -n delete -net 10 {{ ansible_default_ipv4.network }}

    - name: Add a network route
      shell: route -n add -net 10 {{ ansible_default_ipv4.network }}

    - name: Capture the route to inspect for the new gateway
      shell: route -n get -net 10 | grep gateway
      register: route

    - name: Check that the route was added
      debug:
        msg: "Route was added: {{ route.stdout }}"
      when:
        - route.stdout.find( ansible_default_ipv4.gateway )