wireguard generates error that the protocol isn't supported. how can I fix this problem? I have also R2S and wireguard works there perfectly

hello
it looks like wireguard is not working for latest version of FriendlyWrt. Logs said "the protocol not supported". Is it known bug? wireguard is included in default kernel. I use wireguard successfully on R2S and never saw errors like that. Please help to understand