I tried getting a screenshot of the bug, but I’m not sure how screenshots work with Last Epoch, as they don’t use my default Steam keybind.
Last I recall, this node in the Necro passive tree used to be that of the Putrid Wraith, but was switched in a patch over to Skeleton Vanguard. However, when you press Alt to view the stats of the Vanguard, you get the Putrid Wraith’s stats instead.
It is easy enough confirming on Dammit’s LastEpochTools, but I confirmed in-game that this is the case. It is also likely the case in other passives in the Necro/Lich tree that used to have Putrid Wraith summons, but are now Skeleton Vanguards.