Problem seems to be related to wg(4) on 21.1.4 is missing POINTTOPOINT interface flag. Sensei's interface initialization was reliant on this flag to determine if a particular interface is a point to point interface. I guess this change is due to the recent improvements to the wireguard subsystem. We'll ship a package handling this case momentarily. UPDATE: 1.8.2 packages built and awaiting final test results. Release planned for tomorrow.