The title sums it up nicely. If you try to make a level 0 Triforce in the item editor, it will revert to level 1 when you hit OK. The problem is that the Triforce (Whole) needs to be at level 0 to function correctly - defaults even sets it to that. Now, I won't deny that what happened when I grabbed the wrong type of Triforce was funny, but this does effectively bar you from ever passing Ganon's room (he, for some reason, revives after all the nonsense is finished).
Item Editor won't allow Triforce level 0 (b346)
Fixed in the next build.
Hang on - shouldn't the Triforce's function be dependant on Power or a misc. value, perhaps?
Go for it.
I don't why not to allow a level 0 item anyway; at the very least this stops ZQ from changing the item properties when you click "OK" on an item that already has level 0.