You could post up these rules you created on the lagg interfaces.
You stated you can not ping the pfsense IP of another interface?
Lets say lagg1 is 192.168.1.1, and lagg2 is 192.168.2.1
And your on a client on 192.168.1/24 say 192.168.1.100, and it can ping 192.168.1.1, and it uses pfsense (192.168.1.1) as its gateway? But can not ping 192.168.2.1?
Lets see the rules you have on lagg1 interface.