Lol! I'm getting tired of talking about terrain database in the hornet, it's time ED clarifies this once and for all. But yes, hornet does have DTED instead of the DTSAS of the hog.
Back to topic, I understand the bug now, and paradoxically it is exactly due to the fact I use to say that it isn't a bug. So it seems that the HMD LOS limitation are taking over a predefined tgt and clears its elevation data like it had beed created there in the first place, therefore jeopardizing the spot. Common bug in first stage of a feature.