Wake On Lan - not working on WAN

[dnf]

I just installed Gargoyle 1.12 on my Archer C7 V2 and I have problem with Wake On Lan to my PC with Windows 10. Previously on stock firmware it was working well but now it is working only from LAN not from WAN. I configured port forwarding for 7 and 9 but still not working. I have external IP and when PC is turned off I can see packages arriving from Wake On Lan app from my phone in “Connection List“ page – but they are not waking my PC. The other strange thing is that I can wake my PC when I send magic package second or two after hibernate – couple seconds later it can be waked only locally. Is there something I can configure to make this working again?