I've noticed a degradation in quality with the user experience in OPNSense. The poorly designed (new) GUI's around IPSec, NAT, and now the DHCP server are one thing. However, now I've also noticed that in the last few versions that just going through the setup wizard no longer results in a functioning system. At least when it comes to using a static WAN address.
Just try it, download an image, assign your interfaces using the CLI, then open up a web browser. Go through the setup wizard and experience how you get no internet connectivity on your client machines. The OPNsense device it self can connect, but nothing behind it can.
You have to 'know' to go into your WAN interface and select your gateway because it defaults to "disabled", despite you being asked to enter it in the setup wizard.
I've been able to reproduce this multiple times, so please don't come back and say to me you that it works for you. :)