Possible bug in 0.926C

I'm not sure if this is a bug, or if it's how it's supposed to be.

If memory mode switch is on, and the target is shot and disintegrates, our radar loses target lock and the red light comes on showing it's in memory mode.

But the red light doesn't come on if the target disappears for other reasons. Like flying out of range, or hitting the ground.

Is that how it's supposed to work? Because the radar is still moving by itself even after the target is out of range, like it's still tracking it, or tracking in memory mode.