Is this intended?

So I was playing a bit of casino mage and turned a 4 cost card into that new druid card with energy shaper that is something like “infuse 6 this costs 1” and after infusing it, the card still costed 4 mana instead of 1. Is there something I am missing or is this a bug?

Did your card have a yellow glow around it, in your hand, or a green one?

When the infuse conditions are met it changes from green to yellow.

I don’t recall the glow but it was definitely infused as when the card changed the mana cost went from being green showing it was discounted to red