in Luci–>Network–>Interfaces to the right of the WGCLIENT it says: “Unsupported protocol type. Install protocol extensions…” I have clicked the link "Install protocol extensions" and it comes up blank. I also searched installed and available for ‘luci-proto-WireGuard git-21.243.21928-71fe35c ~3.3 KB Support for WireGuard VPN’ and nothing found. I tried this on both a Mango and a Puli. Wireguard tunnel is setup and connected.
The implementation of WireGuard inside the GL firmware is different.
You can ignore this message.