Question AR Raycast not working on losing focus

Hi.

I'm making an app where i have to place 3D models, and drag them on previously detected surfaces.

The issue is that whenever the app loses focus, raycasting on surfaces doesn't work anymore (ARRaycastManager.Raycast is always false), so i can't interact with 3D models. I'm sure surfaces are not deleted, because i can see surfaces grid on regaining focus, and no trackable is removed from ARPlaneManager.

Thanks in advance.