Are you sure Tailscale in Docker is creating a wg0 interface? Because I got a working connection between my smartphone and my home server and the home server is not showing any interface related to Tailscale?
default via 192.168.178.1 dev ens18
172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1
192.168.178.0/24 dev ens18 proto kernel scope link src 192.168.178.178