Profane Ritual not gaining damage from increases to spell damage

When using threaded light focus for % increased spell damage per 10 spirit I am getting no increases to the damage over time like the gem states.

- Using a rattling sceptre and morior invictus for spirit

- rattling sceptre for skeletons to cast profane ritual on with sacrifice enabled (working)

- infernal legion on skeletons to inflict ignites and drain ailments on profane ritual, not pulling the ignite off from what I can tell, no extra damage is applied from what I see when looking at damage numbers on campaign bosses

- threaded light is working with skills from implicits since putting on a withered wand shows the increase

- spell cascade also not working on profane ritual even with 10 targets next to each other (clerics + rattling skeletons)

thanks for the reply, yes drain ailments not working makes sense then.
Is it also not gaining %inc spell damage correctly?

5 months later and Profane Ritual is still not getting increased damage from spell damage. Skill is unusable still.

Bump, it's not gaining damage from anything but chaos damage - not 'spell damage', not 'damage over time', not 'more damage' nothing. It even consumes Power Charges from Lich passive notes but won't get the positive effect. That is clearly not intended.