Tailscale now blocks wan gateway traffic


i used tailscale with previous OpenWRT builds on my Gl-inet 750s router, without problems (based on v19).
now i upgraded to the new v4 firmware which is based on OpenWRT v22. Tailscale is still present on application list and there's even a plugin for the web gui which lets user to set some options. Too pity that it's completely broken: as soon as tailscale service is up, wan connection closes (wifi client). disabling tailscale brings wan back to work. Any ideas?