No cure button is displayed when zombie villager is given weakness then golden apple

I searched the internet about curing zombie villagers. I splash them weakness, but the golden normal apple just attacks them!(i click them) Am I right on the steps? Is anything I did wrong?

Steps to reproduce

• Find a zombie villager or convert a villager into a zombie villager.
• Splash zombie villager with weakness potion.

Observe that no "Cure" button is displayed while holding a golden apple in your hand over the zombie villager. Instead of being able to cure the zombie villager you just accidentally hit them with the golden apple instead.