Custom item names don't apply to SORTKEY or OUTPUTNAME

When making a custom item, the custom item's new name doesn't apply to SORTYKEY or OUTPUTNAME if the original item has those tags. For instance, if you have a custom short sword (Display name "Sword, Short", SORTKEY "Sword, Short", and OUTPUTNAME "Short Sword") and you name it "Firebrand", the item will appear in the item list in the 's's, and the output sheet will still display "Short Sword".