Result count : 1
This is weird. You’re solving a multi-objective optimization problem, but there is only one solution. I think the problem with the demand restriction is just difficult to solve?
Did you try excluding the 0 >= 0 constraints, like I suggested in HiGHS Error: No invertible representation for getDualRay - #16 by odow?
Any other solver could do HiGHs job is worth trying?
You could try Gurobi