Tree collider Navigation Terrain

I come to get my help today because I have a problem of generation of Navmesh with the field tool! Especially with trees, the function " enable tree collider " and disable! But a collider and detect on the Navmesh! I do not have to collider on my prefab! I tried to deactivate the drawing of my trees but despite all colliders is detected! I send you screnshot if you have a solution I’m a taker!

 

Ah I did the test to download Nav mesh component on git hub! And that’s the problem to reverse this time! My trees don’t have to collide! But the prebab that I pose in the seine yes!