Stray and bogged with melee weapons won't apply the corresponding effect to target

The bug

When a stray or bogged picked up a sword, and then attacking you, you won't receive the slowness or poison effect, this making them are no difference than normal skeletons.

How to reproduce

1. Summon a stray or bogged with can pick up items.
2. Giving it a sword.
3. Switch the gamemode to survival.
4. Let the stray/bogged attacking you.

←You won't receive the slowness or poison effect.