The same is happening for me as well. I have already sent them logs to get to the bottom of the issue. They said they gonna provide a new beta firmware soon.

@Marvin_S Network Topology: The computer with the IPv6 rule of the firewall is connected to a switch connected to the router. NOTE that the configured port is just one example of what I tried. None...

@Marvin_S Hi, I am having the same exact situation(same router, same firmware) and the configuration looks exactly like in the post. I also want add some firewall rules for devices to be accessible...

@Marvin_S Hi, I am having the same issue. I am trying to access a server hosted on my local network. Could I please also get invited to this email feed to be informed about possible solutions?