Conduit attack particle invisible

If you have a full conduit (he open his eye) and he attack a mob the particle invisible. 

Steps to Reproduce:
1. Place a conduit in the water
2. Place prismarin bricks until the conduit has the open eye
3. Place a drowned person next to the conduit

Observed Results:
The drowned receives damage from the particles of the conduit

Expected Results:
The drowned receives damage without the particles of the conduit