As stated in the title, the Overload Captain that spawns near the 2nd Fallen Barrier within the Master Lost Sector (3rd Overload Captain encountered in Master Difficulty) instantly recovers from its disrupted state after being hit with its respective mod.
I've run that Master Lost Sector twice, and both times had the same captain with the same instant recovery. I ran that lost sector about a week ago so I may not be sure about current details.
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I can second this. You can shoot the champion with a Bow/SMG and it plays the sound for him being stunned, but he comes out of the stun and regens his health immediately. Essentially you have to overpower his Regen to kill him.