Sometimes Lavianga's Spirits won't recover any mana while wearing Nightscale

Bug Report ID: #3900280038

I've found out that sometimes when I run out of mana due to using Nightscale, Lavianga's Spirits isn't recovering any mana.

I have to take the flask off and put it on again to make it work.

This really sucks since it usually happens when the mana is protecting my life from hits and I have no recovery otherwise.