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If you follow the official documentation for creating a LAN bridge, specifically step six, that will fix your problem.

https://docs.opnsense.org/manual/how-tos/lan_bridge.html

Perfect, that worked, thank you very much, I should had gone to the official doc first, I didn't think it needed a tweak and that's on me ;-)

Did you set the two mandatory tunables as documented?

No, pretty new to OPNSense, everything is working though, I have AdGuard, moved to Chrony, I have firewall rules for DNS and time server, care to tell what I need to check and where? I have just a basic network, bridged LAN ports + WAN with VLAN required by my ISP.

I have the following rules created by default, exported then imported in the new Rues [new] (I followed the migration assistant)

My LAN is a bridge of all Ethernet except for the WAN, but in order for any PC within the LAN be able to communicate with another member of the LAN I need a 3rd rule (1st on the screenshot), if I specify the LAN as interface, it doesn't work (tested with basic ping), in other words, it is only working in the way it is in my current screenshot: