0.3 Acolyte Mana Leech Bug - Sap of Nightmares

I noticed a lack of mana when changing to a quarterstaff with mana leech and swapping off a ring with less % leech. I have the acolyte ascednancy passive 'Sap of Nightmares' which reads: "Leech recovers based on chaos damage as well as physical damage'

Looking into the skill description I noticed that with just the quarterstaff equipped I have 'Main hand mana leech from physical attacks' = 7.17%. This is listed under on-hit effects and 11% greater than the qstaff mod value due to my ascendancy.

If I then add the mana leech support gem this stat is removed from the on-hit effects and I gain 'Main hand mana from physical attacks' = 16.05% & 'Main hand mana from chaos attacks'= 8.88% in the blue text portion of the description.

If I then equip my previous ring with 6.75% mana leech (inc 11% from ascendancy) these values update to: Main hand mana from physical attacks' = 28.81% & 'Main hand mana from chaos attacks'= 15.63%.

From the skill description it is pretty clear that the mana leech from the quarterstaff is not being converted such that it applies to chaos damage as well as physical (as works for mana leech from rings and the support gem).

I have a build that uses nearly purely chaos damage so the lack of leech was very noticeable when switching from the mana leech ring mod to a quarterstaff mod.