Power Depot's Mana Restriction Isn't Being Calculated Right for Showing Something is Castable

On the board:
- [[Power Depot]]
- Swamp
- Mind Stone

In hand
- [[Audacious Reshapers]]

Audacious Reshapers is shown as cartable, but this is wrong since I have no available red mana. The red mana that Power Depot could produce cannot be used on artifacts (this is an enchantment).

If I try to then cast the spell, I will (correctly) be unable to pay for it using the red mana from Power Depot.