PROVIDES THE ENEMY INFILTRATOR WITH CLOAKING ENERGY.
Haven't followed up on this bug yet, but are you using the default equipment on an Infiltrator? Their default suit slot gives energy back when their shield breaks.
EDIT: As a follow-up. Tested this on Live, and it works fine. However, because we don't pause energy regeneration at all, and since the drain is fairly minimal, it can be easy to miss the effect. There are some improvements to Disruptor ammo we can make to give this more punch.
EDIT2: After further investigation, looks like there are some missing effects on the Tempest, Guardian, Shadow, and A-TROSS. So provided these were the weapons used for testing, it's definitely broken.