I didn't even know that's what it was called, but it's gone and I want it back lol
It shows on the monitor but not in VR. I don't know how it happened, I kept it over my left wing before it disappeared.
While writing this, I went off-line and found a sliver of something dark almost directly over the pilot's head. It didn't show in the tower or hanger but tonight I'd made it completely black and used a wwi plane. Once I spotted it in external view, I could see and drag it back where it belongs from the pilots position.
The thing is, I could not find a VR config file for it's position so I'm pretty lucky I finally saw it, it was that tiny.