Just as said in the title, tested in Duviri and on normal starchart missions, with different melee weapons and all.
Tapping E works as normal, but auto melee doesn't.
Also, it shows that Chroma is "unarmed", in the melee weapon name placed on the mission hud.
spectral scream with the elemental ward, both at different elements make a nice pair for a condition overload melee build. It's a shame that auto melee is bugged for this specific playstyle.