LOD not working even in Scene view

After recording the video, I finally noticed the error:

Instancing: Property 'unity_LODFade' shares the same constant buffer offset with 'unity_RenderingLayer'. Ignoring.
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

Looks like there existed similar bug just the other way around and presumably was fixed on 6000.0.21f1.
My is 6000.0.26f1.

At first, I noticed that almost all my LOD groups stopped working at build, then after some digging, I found out that they stopped working after changing the scene file and nothing else, not sure what particularly caused this, there were a lot of changes.
Interestingly the LODs made with Amplyfier always show all levels active while the LODs made with PolyFew show only the last level.

ezgif-7-e150e266f3

Edit: I tried upgrading to 6000.0.32f1 without rebuilding the library and the problem still persists

I found the reason - I placed another LOD group on top of a parent. So, my bushes were controlled by two different LOD groups. There is no bug