Ability upgrade Multiplicity doesn't seem to work on Entropic Sphere

As the title says, the Ability Upgrade: Multiplicity does not seem to work with abilities like Entropic Sphere. Nowhere says it shouldn't as it is a projectile Ability. 

I've read people also wandering about other abilities not working with Multiplicity like chain lightning or even Dark Squall. When I Tested Dark Squall myself, it doesn't seem to shoot 2 balls at any rate.

I'm on Xbox Series X.