Artillery Ballista bugs?

Would like to check if the following are bugs or as designed for?

1. Sapphire Jewel stat, "Recover 2% maximum mana on kill" not recovering mana from monster kills of Artillery Ballista totem.

2. Notable passive Time Manipulation and small passives Debuff Expiry, "Debuffs on you expire 10/20% faster" are not reducing duration of random curses which are debuffs inflicted by unique body armour Soul Mantle Sacrificial Mantle "Inflicts a random curse when your totems die...".

Thanks!

Although curses are technically a debuff, I think they're in their own independent category as " curse ".

The mana on kill not triggering on your ballistas is because unless they kill with an ignite or damage over time effect, they're not considered your kill. They are their own entity separate from yourself. Any on kill effect has to be from a damage over time component of them (at least in poe 1 that's how it worked)