something is blocking my port with windows defender disabled

[Windows 11]

I know this is a common problem, usually because people either have a double NAT, or they didn't port forward properly. This is not the issue in my case and let me explain.BACKGROUND:I have my main router (router 1) and a secondary old router (router 2) on my network. The pc i would like to port forward to is connected to router 2. so it goes: internet > Router 1 > Router 2 > Target PC.I am pretty sure i DO NOT have a double NAT, as on router 2, DHCP and firewall is disabled, and on Router 1's settings page the target PCs ip address (192.168.0.239) is displayed as a connected ethernet

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