HISM problem with culling

Hi, UE guys, I am new with UE, but have experience with other engines.
I began to understand the work of instancing, culling and LOD systems and find some problem and some questions.

  1. Find strange behavior of culling for Hierarchical Instanced Static Mesh (HISM) in blueprint. Problem was reproduced in test project. Culling is cuts off geometry which is must be visible.
    Maybe exist any configurable object bounds for culling, but I not find it.

  1. HISM scene object → Details panel(of HISM component) → Instance End Cull distance
    This parameter doesn’t affect on visibility of scene objects. This parameter did not produce any reaction on culling.

  1. I didn’t find any possibility add custom params for instance - only transform.
    Can I get per instance info in material: current LOD, LOD blend factor (on pic. for understand terminology)?
    It will be also good for setting any custom per params…

233754-hism-culling-blendfactor.jpg

In attach simple project that reproduce problems (open level in: Context → HISM_Culling)
[test project][5]

Problem 1 and 2 not reproduced in UE 4.19 - not actual.

Anyone can get solution on problem 3?
Previously we use some per instance customization - this opportunity was very much in demand with us.

Find issue 2 as registered bug in tracker Unreal Engine Issues and Bug Tracker (UE-53024) , but I am not reproduce this in test project with 4.19 (target version for bug fixing is 4.20)