Evocation_illager and Vindication_illager do not display custom items in head slot or custom held items when attacking.
Have tested with 100% drop rate and custom items drop on mob death but are not visable on living mob.
Vindicator will display iron axe when attacking even if weapon is replaced.

Tested other armor slots but seeing as they did not drop I'll leave that for suggestions on Reddit.

Affects snapshot 16w39a