Wireguard on OpenWrt Dumb AP No LAN access

I have installed Wireguard on a Xiaomi 4A Gigaibit which is configured as OpenWrt Dumb AP.
The tunnel is working and I can ping or access LuCI on OpenWrt Dumb AP ( but can't ping ISP router ( or any other device on LAN.
It works well when the AP is configured as router.

Is there any solution to this problem?

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Enable masquerading on the LAN firewall zone.

I followed the guide below and disabled firewall, dnsmasq and odhcpd.
I guess it has something to do with no routing on AP.

uci set firewall.@zone[0].masq="1"
uci commit firewall
/etc/init.d/firewall enable
/etc/init.d/firewall start

Thank you very much, now it's working.
I have no WAN intefrface.
LAN and Wireguard interfaces are in the same firewall zone and masquerading is enabled.

Could you please explain the theory behind this???

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