Shulker boxes missing dye color

When dying shulker boxes, all but 1 dye color is available. When dying to light grey, the box comes out grey with light grey name, you do not have option to dye a grey shulker box, it does not exist in recipe menu. All other colors exist (light grey shulker box looks like the grey dye, not light grey dye), just not Grey Shulker Box. Is this intentional or an oversight?