Fake news.
The pilots never saw anything, their NEW radar presented an unusual display/image that could not be verified visually.
Most likely a glitch in the system. Many such reports, all with the NEW radar system, none with other model radar systems, or the systems on board the carriers.
To think these well-trained radar operators and pilots wouldn't know as much as a Monday morning Freeper about such matters.;-)
The pilots never saw anything
See post 56 - they are real and not fake news. See video taken at the time while objects were being observed VISUALLY.