Bug: Hero units are feared forever until they die. You lose control and don’t regain back control. Using medivac doesn’t cure them of fear. Non-hero units (scv’s) are fine.
I was able to duplicate this and also experienced it originally in-game during solo queue Brutal+1.
Commander - Tychus (Technical Recruiter) (max commander & mastery)
Map - Void Launch
Mutators - Fear, Temporal Field, Twister
(originally random mission, & brutal + 1)
I have replay(s) if needed.