More recovery if used while on low mana does not seem to work? POE2

Item Class: Mana Flasks
Rarity: Magic
Persistent Ultimate Mana Flask of the Plentiful
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Recovers 310 Mana over 3 Seconds
Consumes 10 of 106 (augmented) Charges on use
Currently has 96 Charges
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Requires: Level 60
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Item Level: 80
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71% more Recovery if used while on Low Mana
42% increased Charges
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Right click to drink. Can only hold charges while in belt. Refill at Wells or by killing monsters.