Stormbind Interaction with Eldritch Battery

Here is my issue and I'm hoping this is a bug and that this isn't just working as intended.

The Runeblast component of Stormbind does not improve the runes when using Eldritch Battery. I get that my skill cost is being paid in Energy Shield. But if this is working as intended then the wording being used in skill descriptions is functioning inconsistently.

For example: Eldritch Battery says "Spend Energy Shield before Mana for Skill Costs". Rune Blast says "A rune is improved for each 24 Mana spent" but paying this cost from Energy shield with Eldritch Battery isn't improving the runes. However, Arcane Cloak says "Spends 64 percent of current Mana" and "Buff grants Added Lightning Damage equal to 14% of Mana spent by this skills effect" When I use Arcane Cloak it spends my Energy Shield before my Mana as I would expect and it gives me the lightning damage based on the cost of the ability (64 percent of my current mana), regardless whether the cost is being consumed from my Energy or my Mana. The fact that I'm spending ES instead of Mana is not lowering the lightning damage added by Arcane Cloak. This looks to be functioning, so why doesn't the Runic Blast component of Stormbind improve my runes when I have Eldritch Battery?

FYI (Using Blood Magic with Stormbind/Rune Blast also doesn't level the runes)

Yeah I noticed this inconsistency as well and assuming it's just a bug that can hopefully be resolved quickly.

This is not a bug. This was confirmed by the developers in a reddit Q and A

https://i.imgur.com/goRV7PV.png

Sorry!