anomalous flameblast + alchemist mark

So anomalous flameblast with 100% conversion to chaos and blackflame ring doesnt proc alchemist burning ground effect. If you have less than 100% chaos conversion it does proc burning ground and caustic ground at the same time. So there needs to be clarification on the skills or they are not working as intended. Alchemist mark states "Curses a single enemy, granting flask charges when you hit them and creating Burning Ground under them if your hit Ignites them". It doesnt specify that it has to be fire damage to ignite them.

You don't ignite the target with Anomalous Flameblast with 100% conversion to chaos unless you're elementalist with the ignite node or some other witch ascendancy using the 2 jewels to get that node.
It's working as intended.

I think the problem is you misunderstand how Blackflame works. It doesn't allow or cause your chaos damage to ignite. It just does a damage shift and causes enemies to take ignite damage as chaos damage. You still need to do fire damage, and you still need to scale fire damage. If you're converting 100% of Flameblast fire to chaos, you can no longer ignite with Flameblast. Alchemist's Mark isn't relevant to this.

What you need if you want chaos to ignite is Replica Volkuur's Guidance gloves. Or be Elementalist (or have her Forbidden jewels).

thank you for clarification