I have observed a bug in the Firewall Rule config page on B10 and B11.
If you select the option CHAIN and then select a target rule, the target rule is not set in iptables when Confirm is pressed, if the target is the default value in the drop-down, and you don’t explicitly select it.
The effect is the iptables rule does not have a -j target_rule – despite the metadata about the rule still remembering what it should be – so the intended target shows up when you edit the rule again.
To work around this, select some other rule as target, then select your desired target.
I expect this is a simple bug in the web page scripting.