Running the ISOROPIA_B module in CMAQ adjoint mode results in a sensitivity of 0

Hello, I am running the ISOROPIA_B module separately in cmaq-adjoint v5.0. I set the cost function to gaseous NH3 and HNO3. The values of gaseous NH3 and HNO3 changed before and after running the ISOROPIA_B module, but after running it, the value of wib is 0, and the values of gasb have not changed.