Sorry, I don’t understand this use case. Why do you need 2 mono loops in the loop switcher for Path 1? You will only be able to use Path 1 in mono for a single location in your loop switch signal path.
I would suggest using a single mono loop for Path 1, and a stereo loop for Path 2. You can use the loop switcher to determine where either of the paths are, and if you leave the H90’s output mode on auto this will work correctly.
