[Druid Meta Bug] - Purity of Fire - Scepters allows using support gems without reserving any spirit

Hi,
This has been reported ~1 year ago already but it even more relevant now with the new Druid class!
With druids being able to use scepters thanks to "Lord of the Wilds", this is the new META now!

The bug is:
You can use a Purity Of Fire scepter and allocate any spirit reserving support in it for free, which gives you insane mana reg, life regen and other skills.
If you try to support any other aura from a scepter, it will correctly reserve the spirit cost. Only Purity Of Fire seems to work in this way!

That's why I'm at least 99% sure that this is a bug!

Scepters like this are more expensive now on the market, showing that a lot of players make use of this bug.

Please fix, or make all scepter auras work like that!

Thanks!

Small correction, this is working for any "Purity of XYZ" skill, not just fire.