I play on XBox using No HUD, and the Azrael drones are getting really frustrating.

Apart from the fact that they fly directly overhead every single time, they make no noise at all. So, without HUD it's very hard to detect them.

I hear from users on Reddit that these Azrael drones made a noise in the BETA. But, a number of users are saying they are currently silent, as they are for me.

So, what's the design here? Noise or silent?