The screenshots that DF shared / quoted are from when Myztero was being tested in beta.
They don’t really relate to this bug as Myztero absorbs and uses the ailment (which is just the burn) so makes sense that it doesn’t gain the “extra damage against nature” part as that is dictated by the special skill, not the ailment.
This however is different as Lord Loki should copy and execute all elements of the special skill…
Flagged for developer QA attentions.