after upgrading to babylonjs 4 got issue with instanced meshes that are loaded incrementally.
If they are not fully in camera they start to disappear / appear depending on camera angle.
was working fine with babylonjs 3, but I recall similar issue already in babylon 2
if same file is loaded without incremental it works fine. Checked meshes in inspector but they have same props and they don’t react to any changes.
Will try to debug more but maybe someone have idea what to look for or hwo to debug this at best