Guild Wars 2

Lets say you made yourself an Ascended backpiece. You then transmuted it to attach one of the Mad King book skins.
Now you want to upgrade it so it comes with inherent agony resistance (eg Bowyer’s Delight to Bowyer’s Delight (Infused)). So you stick your transmuted backpiece into the forge. What happens ?

Does is spit out the upgrade version with its default skin, thus destroying your irreplaceable skin ?
Does it refuse to upgrade it, forcing you to grind out the material for the Bowyer’s Delight a second time ?

Or does something happen that doesn’t punish players for wanting a different skin to the one that comes with an items stats ?

You cannot upgrade it. Transmuted items cant be used for fixed recipes in the mystic forge.

Malediktus.9250:

You cannot upgrade it. Transmuted items cant be used for fixed recipes in the mystic forge.

Ah, so ANET is punishing players who buy transmutation stones.

The items are getting a new item ID when being transmuted, so the mystic forged does not recognize them anymore. Guess they were too lazy to make it proper.