Focus Square jitters in finding mode in Unity Arkit

I am using the FocusSquare.cs from the Unity ARkit 2 in my iOS scene. During plane detection when the Focus Square is in the "finding state", it jitters alot and sometimes I can see two squares instead of one. When the plane is found and its state changes to found, it doesn't jitter at all. I have gone through the code but there seems to be nothing that could cause this, in there. Please Help