*illusioners are not in the raid mob group yet they can have raid banners.
*Killing an Illusioners with a raid banner gives a glitched bad omen effect. 
*Illusioners Split when given the invisibility effect
*illusioners can fail to separate during attacks and it makes them stack.
*Stacked Illusioners can fail to recombine and instead separate for a small amount of time.
*Bells Highlight Witches and illusioners when rung.
*Illusioners can prevent raid mobs from spawning in a raid.
*An Illager Weapon's hitbox highlighted instead of texture outline when rung
*Illusioners won't pick up bows with better enchantments