ZeroTier - only one way connection

Hi all!

little problem with ZeroTier configuration.

Two routers, both on OpenWRT. All devices on both networks can ping each other. Network1 clients can reach files and connect services like remote desktop to Network2 clients, but only one way. N2 clients can not reach N1 devices.

Something wrong with Firewall? I couldn't find any differences in configuration. Both routers on the same version (OpenWrt 19.07.5).

Only difference is that Network1 has a static public IP and ZeroTier says "Not private IP space". Is it important?

Collect diagnostics from both routers and post it to redacting the private parts:

ubus call system board; uci show network; uci show firewall; \
ip address show; ip route show table all; ip rule show; iptables-save