No internet access in bridge mode on router

Why router has no internet access in bridge mode? There is hap ac2, which is connected to hap ax2, the router itself does not ping any sites, but when checking firmware and connecting clients on wifi after it - the internet is there. What is the problem with this? Please help with this. On ROS6 everything works as it should. The goal is to make a WG-gateway, which will be located after the main router.

Stepped on my own rake with the drop icmp rule in raw. But the question remains, why does BTH on the router behind another router create a wireguard with a relay server? The port is set in dst-nat after creation, but still the connection is not direct.

Very little info provided.
Network diagram is a great start which shows ISPs, intent of wireguard etc
Config of both routers
/export file=anynameyouwish (minus router serial number, any public WANIP information, keys etc..).

Which Router has a publicly accessible IP ( or can forward ports from ISP router to MT router ).