Beryl AX, unplugging LAN cable kills internet

Hey everyone,

I just got my Beryl AX last week and have been happy with it, but today I discovered a very strange bug.

Whenever I disconnect my LAN device, the entire router loses internet connectivity.

However:

• The Admin Panel still reports the WAN interface as UP with a message "The interface is connected but internet can't be accessed".
• As soon as I plug the LAN device in, the internet instantly comes back.

To isolate the issue, I disabled everything:

• All applications.
• All VPNs.

Even with all of those off, unplugging the LAN still took down the internet. The only system log events generated were:

kern.info kernel: mtk_soc_eth 15100000.ethernet eth1: Link is Down kern.info kernel: br-lan: port 1(eth1) entered disabled state daemon.notice netifd: Network device 'eth1' link is down 

I do had a VPN policy configured previously that was set to exclude this specific LAN device from the tunnel. The only solution I found was completeely delete that tunnel and reboot. The firmware is 4.11.0 btw.

Is this an expected behaviour or maybe a bug?

Thank you in advance!