I'd appreciate if someone could advise on my problem.

I use one on-device image target and a single 3D model. I use Unity extension and then export the scene to Android project. I also use Extended tracking.

My 3D model is looking fine when it's  small, see Screenshot1.png.

But if I try to make my 3D model larger by increasing the scale, and  when I move camera far from the target,  the  model gets partially invisible, see Screenshot2.png.

I tried to reposition my ARCamera but no luck.