If this issue has been reported, please tell me.
I found that if you use a random item on the Blood Altars in the Void World, quickly take it back then go back to the Overworld; when you go back to the Void World (seem like you also need to do it instantly), another item will appear on the Blood Altars, while you still hold the original item.
Also if you go back the Overworld and come back the Void World, there will be a chance to dupe that item again.
If this issue has been reported, please tell me.
I found that if you use a random item on the Blood Altars in the Void World, quickly take it back then go back to the Overworld; when you go back to the Void World (seem like you also need to do it instantly), another item will appear on the Blood Altars, while you still hold the original item.
Also if you go back the Overworld and come back the Void World, there will be a chance to dupe that item again.