I had a vessel in fairly low orbit of the mun (5km to 6km). Although this is lower than the highest point on the mun, I watched it make a full orbit before leaving it. I then sent another craft to rendezvous with it, but as I switched between map view, it suddenly stopped appearing on the map. Unable to complete the maneuver (as I had no target), I reverted to launch and watched the craft orbit the moon fully again without crashing. Is this a bug? Is there a point where a craft that's on rails will crash by default?
