Hello, I have a world for a long time and I want to zombie the villagers and cure them but it won't let me make potions of weakness, other potions it does let me but not for weakness because the fermented eye doesn't make the potion, thank you.

It doesn't let me make weakness potions but it does let me make other potions.
What I expected to happen was...:
Describe what you thought should happen here

What actually happened was...:
What I thought would happen was that I would have potions of weakness.
Steps to Reproduce:
1. First make a rare potion with Nether Wart.
2.with those potions put fermented eye
3. I don't get the potion,