Trident Weapon Won't Work After Picking Back Up

I made a trident-like weapon that sticks into the ground and can be picked back up. It also has a basic melee functionality. However, upon picking it up, it cannot be thrown a second time unless I go into creative. In the code for the item, and not the projectile, it says:

                if (player.getAbilities().instabuild) {
                    projectile.pickup = AbstractArrow.Pickup.CREATIVE_ONLY;
                }

Does anybody know what I should change so it can be thrown after being picked up?