Thanks @hnyman for the info. I tried using the image I flashed and setup a simple firewall rule to deny a specific IP address access to the WAN. Although it shows active, I can still ping and connect from that device to the WAN so the firewall is not working properly on the latest build from master for me.
Reverting to the image I build from 02-Feb wherein fw4 was reverted does work.
I created this thread to discuss the issue rather than hijacking the original topic which was about the status page. Thanks all!