When you define heterogonous fields, you may define a sub-array in one orientation, a sub-array in the second orientation, and a sub-array "Mixed" in which some strings are in the 1st orientation and other ones in the 2nd orientation.
Only the "mixed" sub-array implies a combination of the I/V characteristics observed in both orientations, and the result is according to the total nominal power if the "mixed" sub-array.
Now the shading calculations have nothing to do with this. The shading factor is calculated once for the whole system, and applied identically to irradiances in both orientations.
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