I checked the work of Google Directions in my city, and it works correctly.
The route goes through a park, alley and pedestrian crossings.

Perhaps this problem is specific to the route you are trying to find?!
Try to test this for other locations.

I am trying to set the mode in my route request, but even so, my gameobject moves only respecting the direction of the streets.

Am I missing something else?

i need to move in any direction.

OnlineMapsGoogleDirections query = OnlineMapsGoogleDirections.Find(
            new OnlineMapsGoogleDirections.Params(startPos, finalPos)
            {
                mode = OnlineMapsGoogleDirections.Mode.walking
            });
        query.OnComplete += OnComplete;

Thanks for help!