Problems with Port Forwarding

I am trying to Port Forward on QubesOS for Bitcoin Core, and followed this guide: Firewall | Qubes OS.

Bitcoin Core needs to forward port 8333 for incoming connections.

I followed the guide, but replaced 443 w/ 8333, 192.168.x.x with the external IP of my router, 10.137.1.x with the internal IP of sys-firewall, and 10.137.2.y with the IP of BitcoinVM. However, the port forwarding did not work, and it broke my outgoing connections as well. I know it is something I did wrong.

Something that confused me in the guide is how/why the sys-firewall IP is represented in the guide as 10.137.1.x in some places, and 10.137.0.x in others (same with the IP of BitcoinVM - 10.137.2.y vs 10.137.0.y) - and what I’m supposed to do with that.

Searched other posts and found this: https://groups.google.com/g/qubes-users/c/27oGdGvydIg but wasn’t able to find more info.

Thank you for any help!