CST F-Paramaters with Magnetic Symmetry Planes

[egjohnson7]

I would like to use magnetic symmetry planes in my CST simulation to reduce computation time. I have ports placed radially around a circumference for slightly less than 90 degrees of the structure I am using 2 symmetry planes. I am attempting to excite them simultaneously and obtain F-parameter results. I however obtain invalid results as shown in the image below. If I do not use the symmetry planes then the results are correct but it will take much longer to excite the entire structure with ports all around 360 degrees. Does anyone know if using symmetry planes is not allowed for simultaneous excitations like it is for S-parameters?

Thanks
Erik