Poe2 Possible Bug with "Blasphemy"

Summary: Cost of reserving spirit for a curse skill gem is affected by the number of support gem slots unlocked on that curse. Tooltip does not reflect this cost change (or i'm misunderstanding the tooltip text)

Steps to reproduce:
1. Equip Blasphemy
2. Slot in a "Conductivity" gem that only has 2 support gems unlocked
3. Check the spirit cost reservation and whether or not you can activate Blasphemy.
4. Remove the conductivity gem.
5. Slot in a conductivity gem that has 3 support gems unlocked
6. Blasphemy can longer be activated.

I tested it further and I thought it was originally increasing the spirit reservation cost but even when i free up spirit from other skills, it is still bugged for me. Low impact bug since you can just cut a new curse gem.

The issue is that you probably have conduction set to your other weapon. Take conduction out of the blasphemy supports and put it in an active slot. Check to see which weapon set(s) you have checked.

I had the same problem and it was really confusing. The curse "remembers" what weapon set you assigned it to even when it is slotted into blasphemy.