Rule iptables -I FORWARD -i wg0 -o wg1 -j ACCEPT is reset after few days, firmware version 3.203 20210703, on the router A is setup s2s (via GoodCloud) and wg server (from web interface), configured 2 mobile clients, clients have not access to lan Router B after few days.

I’m found what is it. After reboot router this rule is reset.