Whenever I import a data-pack in a "Minecraft" world, sometimes the game doesn't recognize some of the functions as functions. This, likely happened when I tried to test the mod (data-pack, resource-pack) I worked on where you can craft this sword that could give you a lot of luck when you hold it in you offhand. The data-pack was advancement-friendly because most of the time right now, people are now making advancements a way of replacing the item with the item they want to give you because they think that using advancements would be easier and compatible to give you the item right away. If you could fix this, I could show you what I have done to make this completion-est-friendly.