Thanks for the question. I think in this case you will have to create the size of the array manually instead of using Extend X/Y size to area. To do this create a RailClone object using X Y size parameters that is large enough to cover both clipping splines and rotate to the desired angle. For each Clipping area, duplicate the RailClone object and assign the spline. The tiles should now continue across the cuts.
Please see the attached file for an example.
I hope that helps, please let me know if there's anything else I can do.