No preview in Array with spheres if isocrvs and tangent seams turned off

If I have isocurves off (my usual setting) and in a particular display mode I also have tangent seam display turned off, when I do an Array with a sphere, I get no preview at all. I think this needs to be special cased maybe to ignore the tangent seams setting under the preview so we at least see something

Tangent seams unchecked

Tangent seams checked