Problems with quadrilateral zones

[Riddick]

Sometimes it is incorrectly determined whether an object is in the quadrilateral zone or not.
The mistake is difficult to repeat. There is a *.trk file in which this error was repeated and a *..miz file.
At 7:00:37 the plane stops before the red flags in zone "Посадка 2", but the program counts the rollout.

не защитали2.trk

[Riddick]

It’s as if the “Посадка 2” zone suddenly becomes triangular. By the way, here is the mission file.

TF-51D Тренировочный день..miz