Void manipulation prevents ignite with blackflame and Zerphi's heart

Void manipulation has the modifier 'deals no elemental damage' but with Zerphi's heart chaos damage ignites, chills and shocks and with black flame ignite is chaos damage so surely Void Manipulation preventing this is a bug?

That's a very specific and interesting way to implement that mechanic.

Still feels a little weird given that shock and chill still work with void manipulation, I realise they aren't dealing damage but then ignite is still at least half a degree separated from the skill itself.

That is, the damage from the skill caused the ignite but the ignite is not the skill.

My natural assumption was that a chaos damage derived ignite would still ignite even with void manipulation, because the damage causing the ignite was chaos damage and that chaos damage is still hitting and the chance to ignite is still rolling to ignite and ignite is its own mechanic, unlike the burning ground attached to fire trap which is part of the skill and hence would intuitively be blocked by the 'skills deal no elemental damage' modifier.