This will be due to the Visual Sensors and the way that the game tracks objects while under TC.
There are various investigations about how object move/are detected at high TC on Subsim (I CBA to search them out) but the basics are this:
Anything over and above 128 TC the game only monitors certain parts of an objects trajectory.
For example:
At x1 to x64 an object has a standard tracked trajectory and the game tracks it as such: A--------B--------C
At x128 to x512 an object has a skip in it tracked trajectory and the game follows it as such: A- - -B- - -C.
At x512 and above the game will completely miss point B when tracking an object. A- - -C.
This is basically a limitation in the games mechanism and can't be altered.
As such x128 and less is advised to ensure the location and tracking of all objects, especially aircraft.
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