HISM LODs are not indipendet, but just act like a single object

The lod of all instances in HISM, act all like the same, the distance that only matter is the distance of the fist instance.
Everithing looks working fine with a mesh with more then 927 triangles, but with less that 927 the instances all depends from the first instance.

I have the same problem. Has the problem been solved?

You can’t select individual HISMs or ISMs - it selects the HISM/ISM component and all the instances.

Foliage tool has way to select individual ones by doing a line trace to find the instance index and just editing that - but it’s an extra layer.