Wireguard cannot handshake on v19.07.8

Hi guys,

I've recently installed v19.07.8 and I've problem with wireguard handshake. I'm using pppoe (saw people having problems with MTU on pppoe but already changed MTU). I can see on wireguard interface packets are RX but TX is not happening. I triple check keys, allowed IPs, firewall - all is fine (even tried automated wireguard setup. I've performed factory reset and then configured wireguard step by step - no luck. I can see on my macos peer Sending handshake initiation every 5 sec

I'm stuck for two days on this... Anyone having similar issue?