Can be reproduced very easily in the editor:
- place a character and name it unit
- place an objet (computer, rock, car, anything)
- make the character move with
```
unit playAction "walkF";
```
The character will play the animation and the motion vector and the character will also collide with objects.*
- now attach the object to the character
```
object attachTo [unit, [0,0,2]]
```
- try to make the unit move with playAction again
The unit will play the animation but the motion vector will not be played.
https://www.youtube.com/watch?v=ScDzOJ0W18c