Shutdown OS without stopping VPN connection causes no network connectivity

Application

Outline Client

Describe the bug

Failing to disconnect from the Outline VPN before shutting down your computer results in all network traffic being forced down the TUN adapter created by Outline, despite it leading to nowhere. The only way to work around this is to delete the IP and virtual TUN adapter:

ip addr delete 10.0.85.5/32 dev outline-tun1 ip link delete outline-tun1

Note that you cannot even reconnect to your Outline server either when in this broken state.

Steps to reproduce

1. Connect to an Outline server.
2. Without disconnecting, shut down your computer.
3. Power back on.
4. Attempt to ping your default gateway on your local network, or a public IP address.
5. Observe that you cannot reach any IP addresses over any protocol.

What did you expect to happen?

Be able to use the local network connection.

What actually happened?

No network connectivity. Your device does receive an IP address from your local DHCP server, but any attempts to communicate over the network to your default gateway, other devices within the LAN, or any destination out to the internet seems to go nowhere. Attempting to perform a packet capture on the network adapter you are expecting to send traffic out of does not appear, as it is likely being forced down the TUN adapter.

Outline Version

1.15.0 (483121)

What operation system are you using?

Linux

Operating System Version

Pop! OS 22.04 LTS

Screenshots and Videos

No response