Did you set the two tuneables as told in the bridge documentation?https://docs.opnsense.org/manual/how-tos/lan_bridge.html
And you did set net.link.bridge.pfil_member to 0 and net.link.bridge.pfil_bridge to 1? And reboot?And there are no interface assignments for the member interface? Only a single assignment for the bridge - probably to LAN?