I've noticed a bug when mind controlling an enemy that causes the buffs/debuffs to disappear for the unit that you've mind controlled. I only notice this in solo shuffle, although that's the only time I use mind control. I understand the coding behind mind control is quite complex so appreciate this may not be an easy fix, but thought it'd be worth raising it as an issue. Thanks!

When I go outside of Orgrimmar and Mind Control a harpy, my list of debuffs correctly shows Mind Control as having applied to the target.

Are you using some sort of conditions to determine what or if buffs/debuffs need to be shown for the target?