There's something wonky with Asenath's gloves, +1 curse, and Arcanist Brand triggering a curse

I'm having trouble replicating steps, but something's bugged.

Usually it refuses to curse with anything but Temporal Chains (despite having +1 curse). Sometimes I can get dual-curse after the initial curse expires. If I take off the Asenath gloves, the Flammability sometimes works after Temporal Chains expires. Often does not, nor on new enemies.

https://youtu.be/zvXWvgz2Qig (works as expected, dual-cursing)
https://youtu.be/Xb1YWoOlpuo (cannot get Flammability to proc)


https://www.pathofexile.com/account/view-profile/unsane/characters?characterName=unsaneExplosive

The Flammability Curse has a notably higher mana cost than the other spells your Arcanist Brand is casting. It seems like you simply don't have enough mana for it to trigger--especially in the second video, where your unreserved mana looks like less than the mana cost.

I see, thanks! There's no indication that these triggerred skills have a mana cost to be paid. Especially confusing to longtime players for whom triggerred skills were always free.

I suppose Cast When Damage Taken has the same issue of not mentioning anything about having to pay the cost of the skills now, when you never did before.

You're just supposed to magically know, I guess. Oops.