I found there is a wrong symbol in the firewall.config. and its absolute address is https://github.com/openwrt/openwrt/blob/main/package/network/config/firewall/files ...
Useful, for example, if you have Sonos speakers on one interface, or VLAN, and you want to be able to control them from devices on a different interface/VLAN. Similar for Chromecast devices. By ...