Life Remnant skill (Blood Mage Ascendancy) bugged

This seems to be a bug shared between it and Malice (haven't tested with other off-hand auras or passive effects).

The Spirit cost is improperly kept track of, and the skill disables due to Spirit overdraft, even when all Spirit costs are correctly reduced from equipped support skill gems. I believe that these skills have a hidden fee of 10 spirit or so, which causes the bug, though I'm not certain, since I can't adjust the spirit costs with enough specificity to prove it (also, these skills shouldn't have spirit cost, which is the weirdest part from all of this).

Yeah I have this issue as well, to add to it, adding the mana regen support gem which has only a cost of 10 spirit works as intended and having the support gems on another buff skill works as well, only when the support gem(s) is(/are) applied to life remnants it seems to break.

I have the same issue, I have 2 support gems equipped (one of them being the mana regen when active) on my blood remnants skill so in total it should take 30(20+10) spirit, also I have 2 spirit gems each using 30 spirit and no additional support gems using spirit on them. All added up should use 90 spirit and it seems to match the usage of my spirit which is on 32/122 but when I get below around 20 my blood remnants skill turns off like there is some hidden cost not included in the total spirit usage. Hope they soon see this is an issue cause it prevents me with equping stronger spirit gems.