Healing isn't supported by higher number system?

If I heal something for over 2.14billion, it caps at negative 2.14billion, which basically kills my monster, or severely wounds/kills enemies.

I can get over 2.14billion healing by using Breath of Life + Everglow + Rune that increases healing by 100% if creature has mend + creature healing perk and then I heal a creature with a massive max hp.

I can get one of my creatures to 1 billion hp via multiple pit guards + nether trait.

I haven’t reached damage over 2 billion yet, so maybe it might also put damage at negative 2.14billion, so instead of killing things it might just heal them instead?

Combat values haven’t been adjusted with the new numbers system yet, probably will be in the next major patch.