Getting ghostface out of stealth is really inconsistent. There's times where there's 3 people looking at him really close and he doesn't break out. The chase mechanic is wonky, and so is the camera. Those are some weird mechanics to implement and have powers rely on.
Sometimes you can kick him out of it, and sometimes you just can't. I was literally right in front of him facing him, nothing several times. I looked and saw they didn't have any add ons to effect the spotting.