Temporal Rift bug

The spirit cost of support gems slotted on Temporal Rift is getting doubled

This double cost is not stated anywhere in the skill.

The double cost also doesn't show in the bar either.

Examples:

Have 30 max spirit, slot a 20 spirit gem to temporal rift.
The bar will show 10 spirit left but you won't be able to use the skill.
Replace the 20 spirit gem by one that costs 15 or lower and you will be able to use the skill.

Another scenario:
1. Have 97 spirit.
2. Reserve 70 on other skills. (Bar shows correctly 27 left)
3. Slot a 15 spirit gem to temporal rift -> Bar shows 12 left but can't use temporal rift.
4. Remove the 15 spirit gem from temporal rift and place it on the other skills -> Bar shows 12 left and you can use temporal normally.

For this scenario i had:
- 60 base spirit + 37 from gear.

- Temporal rift (0 spirit): second wind 2 (0 spirit) and cooldown recovery 2 (0 spirit) = Total 0 spirit.

- Siphon elements (30 spirit): Harmonic remnants 2 (0 spirit), remnant potency 3 (0 spirit) and clarity 1 (10 spirit) = Total 40 spirit.

- Mana remnants (30 spirit): Harmonic remants 1 (0 spirit), remnant potency 1 (0 spirit) = Total 30 spirit.

Total reserved = 70, Total free = 27.

Slot mysticism 1 (15 spirit) to temporal rift = 12 spirit left but can't use temporal rift.

Remove mysticism 1 from temporal rift and place on mana remnants = 12 spirit left but can use temporal rift normally.

Conclusion: Spirit cost of support gems placed on temporal rift are getting doubled.

Temporary solution is to place only 0 cost gems in temporal rift and place the gems with any cost in other skills.