Docker docs:
Docker routes container traffic in the nat table, which means that packets are diverted before it reaches the INPUT and OUTPUT chains that ufw uses. Packets are routed before the firewall rules can be applied, effectively ignoring your firewall configuration.
I pretty much share the same experience. I avoid using docker or any other containerizing thing due to the amount of bloat and complexity that this shit brings. I always get out of my way to get Software running w/o docker, even if there is no documented way. If that fails then the Software just sucks.