Since last patch me and several other people playing on the same server have spotted annoying problem with prepared herbs.
Namely prepared herbs with positive effect (like Adrenaline, Aquila Wings, Antidote) are loosing their properties after some time since their creation.
Such 'broken' prepared herbs do not give required effect after consuming and when looking at their details you can no longer see positive effect description or it's value.
The time required for problem to occur is quite random as it may happen several minutes after mixing the herbs or few days later.
I have also noticed similar issue with potions.