This is not about clouds or trees or other at least partially visible objects hiding icons. This is about invisible (not drawn) cockpit parts hiding icons.
The enemy is in plain sight, nothing anywhere near that could hide it. Still, suddenly when seen through a certain view, the icon vanishes for no obvious reason. When in that view, moving the head back, it reveals a part of the cockpit. That part of the cockpit then hides the plane.
There's only two reasonable behaviors:
- The cockpit is drawn, the plane is not (hidden behind the cockpit), and the icon is hidden, too
- The cockpit is not drawn, the plane is visible, and so is its icon
Either its possible to look through the cockpit (through parts of the cockpit that are not drawn), or it is not.