Leech lore + Bow

[Demellion]

Grand bug with a bow having +# Leech effect.
The arrows shoot normaly, but if you do hits just with a bow it - it does "not real" damage.

Clearly - the more u click, the faster you kill.
That even leads to severe errors - entity died from "not real" damage just forced to be flushed by server with no drops of EXP and Items.
Any plugins modifying mobs - crashes instantly.

Fix please ^^. Thanks.