Simple. Create a new quest, with selectable items (boomerang, candle, potion, bomb, etc.) in the initialization data or place items in screen and allow Link to pick it up in ZC. There is something wrong with the subscreen layout from the updated new default template. You cannot select them, and Link doesn't have it selected.
Can't select items in a newly created quest with new default template
Fixed in the next build.
I cannot confirm it fixed in 488. The qst.dat needs to be up to date in the next build (which is already done). Still cannot select items. See in thread "Old enemy tile problem: Moldorm" for more info.