I wanted to make an official bug report for this issue, even if it is a minor one, as I have it mentioned in my Tracker – Living Story/Game Update Bugs thread.
Applying a Zenith Achievement Weapon Skin to a weapon removes the previously existing sigil suffix from the weapon’s name in the end product.
Example:
“Berserker Short Bow of Fire” becomes “Zenith Short Bow”, not “Zenith Short Bow of Fire”.
Also, adding a new sigil to a weapon that has a Zenith skin applied to it does not add the new sigil suffix to its name.
Example:
“Zenith Short Bow” remains as “Zenith Short Bow” after applying a new sigil to it.