Graphics Mesh.SetColors(List<Color>) does not work correctly (Mesh.SetColors(List<Color32>) does)

I have some code that is setting vertex colors with a List<Color>(). This was resulting in an incorrect colour, and a small change in the color inspector would result in a huge change in the on-screen output. I switched the List to List<Color32> so it uses the List<Color32> overload for Mesh.SetColors (no change to the rest of the code, as Color casts to Color32 implicitly) and the colours appeared correctly.