Whatever is causing it, it’s actually the same thing with gravity well and an elemental gem. The elemental gem portion will do only a fraction of the main portion of gravity well. I’m guessing it’s related to being a 3rd form of damage from the weapons main type (i.e. musket is thrust, sticky bomb is fire, and elemental gem adds a 3rd element, same with GA is slash, grav well is void and elemental gem adds a 3rd type)
They know about it, and put it on the Known Issues, last I heard they had a strike team on it but it’s a deeper issue.
The effect of the issue is these spawned slices aka objects are only using Base Damage * (Level Scaling) vs the normal Base Damage * (Level Scaling + Stat Scaling) on the elemental portion of the damage.
It must be an issue with inherting or something of the sort.
Using elemental gem on weapons that spawn damaging slices lowers their attack damage
This same thing happens with the blunderbuss, btw. I’ve also noticed it with gravity well from GA. The elemental part of the explosion damage does like 50% less than it should. Seems to be an issue with many abilities. Maybe anything considered a “projectile”.