Flamewalker notable - not working with all Ignited Grounds?

Notable reads "Gain 15% of Damage as Extra Fire Damage while on Ignited Ground"

Burning Inscription (Creates ignited ground after Curse Delay)
Ignited Ground created by Unique boots
Ignited Oil (maybe doesn't counter as 'Ignited Ground'? But it should in my opinion)

Neither of these player-created ignited ground effects provide the promised gains.

Only the map modifier "Area has patches of ignited ground" worked as intended.

Unfortunate.