Landing not detected

Hi,
Im implementig a precision landing pkg for px4 drone and it works perfectly in gazebo simulation the only problem is during the final step: when the vehicle land on the target (at the moment a simple box, quite similar to the “big_box” model.sdf in /px4_sitl/models directory) it will not detect that it is landed and so i can’t disarm it. It looks like that the three condition necessary to detect the ground during landing are not satisfied but i can t figure out why since it is not moving when landed on the target.
Is it a problem of the target.sdf or im missing something?

Hello,
– Intuitively, first jump in my mind is the obstacle modeled in sdf/xml may not set collision tag, just guess.