Such an object would not have meaningful mass and would not leave vortices or a wake, which some of the UFOs do.
It is the same kind of fallacy that causes people to believe that because something was observed somewhere and something similar was observed very soon after that but 60 miles away, that it must have been an object that moved at a very high speed.
https://www.militarytimes.com/news/your-military/2019/07/19/...
https://www.forbes.com/sites/davidhambling/2020/05/11/us-nav...