Gizmo Camera scene view problem

Hello,

i noticed a strange behavior with the gizmo wich allows us to navigate from camera views (top,bottom,left rigth and so on)
the thing is that when i enter in prefab edit mode, it displays on ly 2 arrows instead of 4 or 6
see the screenshot.

i noticed that in the world edit mode, the arrows can be missing, some are only disappearing and reapparaing, depending of the camera angle, and some are simply not changing, and doesn't reapparing anymore.