I had the same issue for several minutes, trying to get on top of that structure because I thought the quest item was on top... though it is not. In fact, it is right where the quest tracker points you to. The only difference is it doesnt look like anything important, and I dont think it 'pulsates blue' like other quest items. If this is the same one we are talking about, it is underneath that big sphere structure(that we tried to get on top of), right next to a moderate size of ship rubble. Just hover your mouse around and you'll see what to click on. Hope this helps.