Hello,
The Bloodvine Set bonus appears to be bugged.
Spells such as Corruption, Curse of Agony, Drain Life, Drain Soul, and Siphon Life do not trigger the set bonus effect.
Additionally, there seems to be a visual issue with the Bloodvine Boots. Even though I have all three pieces of the set equipped, the set tooltip only displays 2/3 pieces equipped.
WDB cleaned and even tried a full fresh Client to Test it.