If you have solar, it needs to be connected to the J35 and not the MiniBoostPRO, otherwise it will not work properly.
If solar is connected to the MiniBoostPRO, there will be two solar regulators conflicting with each other trying to charge the same battery bank, which will cause the MiniBoostPRO to not operate correctly.
This means that you will not receive the benefit of blended AUX and solar charging with the MiniBoostPRO, as the solar will be connected to the J35.