The only negative status effects regarding mana known to us so far, always been mana speed decrease, mana block and mana steal. Direct mana reduction was never a status effect and it’s absurd to even be considered as such.
@Petri how do you even may consider an action of a hero like Chao for example, being a status effect?? Isn’t natural or logical.
Besides, as long as you guys decided direct mana reduction is a negative effect, then should be applied for all heroes in the game, not only for Ursena and Mitsuko, like the release notes say. In this case, Grazul should prevent Guin’s or Neith’s mana cut. Gato should prevent Bauchan’s mana cut for him and adjacent allies.
Since you messed the things up with this change, you should decide whether mana reduction is a status effect and should work for all heroes, not only for Ursena. Or decide was a mistake and remove this being a status effect. Because is not.