Problem with Glamour

So I was trying to copy the appearance of Darklight Cowl of Casting and the said equipment don't even show in the list. I did that some patches before and was possible, now I simply can't. I want to know why I can't copy Darklight Cowl of casting appearance anymore. I noticed that I can the inverse, I can cast glamour on Darklight Cowl of casting and make it appear like a Vanya Robe of Casting for sample, but I can't do the contrary. Any help will be welcome.

(Base Item) Darlight Cowl of Casting / (Appearance) Vanya Robe = Possible
(Base Item) Vanya Robe / (Appearance) Darlight Cowl of Casting = Not Possible

Item glamoured must use the same number of equipment slots (or less) than the base item.

It's working as intended. The intent is just stupid.