Temporal Rift not usable with some spirit reservatioin supports

Starting at 30/30 spirit the skill works fine.
If you allocate Vitality you cannot use the skill while at 10/30 spirit remaining.
Allocating ONLY clarity puts you at 20/30 and the skill functions just fine.

I feel its checking for available spirit on cast even though you've reserved it, effectively doubling the cost of the supports. I'm under the impression that the skill should function fine at 0/30 spirit with both clarity and vitality linked to it.

Encounterign same issue.

+1

Temporal Rift has an unseen spirit requirement of 20, you must have 40 spirit to equip Vitality.