I have some sprite in my 3D scene that doesn’t display under some angles. Here is to illustrate my point (it comes from the camera of the editor but the problem also exists in game):
You can see the shadow very well but not the sprite.
I tried a lot of changes like culling parameters, translucency sort priority at maximum, bouding scale but nothing works.
The only solution I found for now is to use a Plan and make a Material for each sprite.
When a mesh disappears depending on the view it’s almost always a bounds scaling issue. If the bounds does not fully encompass the mesh then it will be culled while it is still in view.