Task: Roekaar Manifestos missing manifesto

SOLUTION!!!! (I think): I experienced the same bug- no datapad at the southeastern camp. However, I stumbled upon an item map for Havarl and there was a location marked at the Roekaar camp west of the north end of the chasm (palaav side). Maybe the last data pad moves after you complete the "overgrown" mission? Here's the map; the locations of the data pads are marked as Bs

http://game-maps.com/MEA/img/Havarl-Map-Mass-Effect-Andromeda.jpg