First off, you do not know that it is “beyond current known technology” unless you are a worker at Area 51 research team.
Second, is it truly performing such maneuvers? I saw a “UFO” when I was a kid. I saw this light in the sky that I thought was a satellite or a high altitude military aircraft. It suddenly made a 90 degree turn. Neither a satellite nor an aircraft can do this (that we know of).
Later, I realized that the 90 degree turn was an optical illusion. While it may have looked like a 90 degree turn, the position of the aircraft in relation to my position on the ground only made it look like a 90 degree turn.
That is just one possible explanation for the “appearance” of impossible maneuvers.
Third, Ss-called aircraft making impossible maneuvers is only anecdotal evidence, which is well known and proven to be unreliable. It is not scientific evidence.