VPN IPv4 gateway is up but dpinger shows 100% loss with "sendto error" code 93

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I had very same setup with another router without problem but for some unknown reason when i recreate settings with this machine this issue popped up.

I followed Wireguard selective routing with external endpoint in Opnsense documentation, using both Ipv4 and 6. IPv6 gateway monitoring has no problem but IPv4 gateway is always down despite that tunnel is up AND selective routing still works. I tried different monitoring IPs.



Logs are filled with error code 93:



Tunnel settings:




Gateway settings:



I tried comparing this setup with previous one but can't find any difference that could cause this issue. Old router has i210 NICs, this new on has i226.

I tried difference sizes of ICMP payload: 0, 1, 60.

I don't think 23.7 is problem because is has been going on before that.

Would love to have some ideas here to diagnosis this annoying issue. Thanks!