The second missive in the Avalon exotic mission is present and collectable, but does not give credit to the seasonal challenge. I am stuck at 1 of 2 collected. I can relaunch the mission and the second datapad will once again appear and can be collected, but will repeatedly not register as collected. Both missive datapads are missing from Battlefield Behemoth. My clanmate was running the mission with me and said they were there and he could collect them, but I could not see them at all.