It doesn't answer your question about the wiper blades, but a common reason for wiper chatter is an invisible residue on the windshield or blades that increases friction and causes the blades to catch. It can happen on brand new cars. I remember reading about this many years ago in a car magazine.
On my previous cars when this starts happening, I try cleaning the windshield and blades really well before replacing them. And I don't mean just a washing or Windex. I use a slurry of Barkeepers Friend or Bon-Ami first, then an auto glass cleaner for the windshield and rubbing alcohol for the wiper blades. That's usually all it takes. If the blades still chatter after that, then I replace them.
There really shouldn't be any reason that brand new wiper blades on the Model 3 need to be replaced already. You should try cleaning the windshield and blades first to see if it will eliminate the chattering. I think there's a good chance it will. If it keeps happening even after doing that and replacing the blades, there could be a wiper arm tension problem that service would have to look at.
