v3.3.1

Fixed

• Quitting a city generated with Enable Physics on no longer stalls for ten seconds or
  more, on leaving Play mode and on closing a build alike. Suppressing the vehicle/pedestrian
  contact registers one ignored pair per (physics vehicle, pedestrian) combination, and Unity
  keeps every ignored pair in a single global table that it rescans in full whenever any
  collider is destroyed — so a scene teardown paid that scan once per collider in the whole
  scene, not just per vehicle or pedestrian. The table is now emptied in one pass before
  teardown starts. Behaviour is otherwise unchanged: pedestrians still never push a vehicle
  around, and the player still collides with vehicles exactly as before.