Cutout frame within area of graph and minor grid lines

Hello,

I've encountered an issue, when using the cutout option within a graph.  For some reason, the minor grid lines of the graph become the same color and style as the major grid lines if they intersect with the cutout once the graph has been exported/saved to pdf.

The template is combined with other templates, a couple overlays, which means that the end product is visible in gIDraw before export.  The lines can be edited therein, to correct the error.

Any feedback appreciated, thank you!