Nibelheim's suggestion didn't work, unfortunately.
Consolid8 published the LOOT_ITEM_CREATED_SELF same as usual as well as the LOOT_ITEM_CREATED_SELF_MULTIPLE at the end of the crafting process. I tried making LOOT_ITEM_CREATED_SELF an empty string, and then LOOT_ITEM_CREATED_SELF_MULTIPLE didn't print at all.
Back to the drawing board.