Couldn’t find a post about this, so here it is.
The new Overcharge and Hypercharge multicast nodes don’t function when the skill is cast by other sources. Arcane Ascendancy, which even specifies that it uses the specialization tree, Disintegrate, and Static all have this behavior with Lightning Blast.
The nodes state that they don’t multicast when [Lightning Blast] itself is a channeled skill, but I don’t think that should apply to the casts from Disintegrate as they are slow single casts. Hell, someone posted a video of a bug where they’re channeling both Disintegrate and channeled LB.
There’s no reason for the nodes not to work with static and AA though.