Anomalous Mana Leech support not working (tooltip)

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Zumzat wrote:

The support gem "Anomalous Mana Leech" does not apply its % damage per 200 mana spent. I have not tested on actual mobs, this from the tooltip damage not changing. I tested it both by using Arcane Cloak which specifically says "Spends X% of current Mana". I also tested it by spending mana through attacks, more than 200 mana spent over 4 seconds and no change on the tooltip. The alternative quality might work but is not reflected in the tooltip.