You can run a 120V load off one leg of a 240V GFCI CB. The neutral for the 120V loads need to connect to that middle screw on the CB.If that is a 120v installation, you have created a dead short at CIRCUIT 1. And, you can't run a 120v load on a double-pole GFCI breaker. It senses an unbalanced load (which indicates a "ground fault"). If it is 240v white wire shouldn't be used.
Never worked that way for me.You can run a 120V load off one leg of a 240V GFCI CB. The neutral for the 120V loads need to connect to that middle screw on the CB.
Never worked that way for me.