Hi.
I have found that all states are killed when the firewall rules are updated ( when you click on "Apply Changes" after making any changes to the rules)
This happens if the "Disable state killing on gateway failure" option is unchecked.
I believe that this did not happen in version 18.10
Please let me know if you need aditional data
Many thanks
Norberto
I'm noticing the same behavior on latest stable 19.7. Did you ever solve this? Maybe it's intended to kill states on firewall changes?