Summon Phantasm Gem Bug.

It was just tested that the Summon Phantasm Support gem does not inherit the generic minion mods from the skill gem it supports, whereas other minions do (like specters that summon minions).

There was an interaction where phantasms did inherit these mods, like in the Heist Spectre gem that gave Frenzy charges.

These seem to include

Herald of Purity, Animate Weapon, Blink/Mirror Arrow "more damage"

Raise Spectre of Transcience critical strike chance

Absolution danage conversion mod.