I don’t think there’s any way to intentionally trigger this bug, I’ve seen it happen with predators with every different weapon in the game and it always triggers from the start of the game, there’s never a time the predator suddenly becomes fully invisible and stays invisible. The predator sees themselves regular though and doesn’t know it’s going on. You can tell the predator in this clip doesn’t realize he’s fully invisible because he keeps using his cloak, which is making sounds that reveal his location when he could just never cloak and be quieter if he knew that he had the bug.
The one good thing about this bug is that the predator doesn’t know that it’s happening, so they do act just as cautious as they normally would and give away sound by turning their cloak on and off or entering the water while cloak is on.