I have revisited every bureau and there are no pages to collect but page 2 is missing from my inventory and I am showing 5/6 on the quest from Haytham.
@andy08thfc Just ran into the same issue. I tried a trick I saw for another glitch. Go to where the mission is and leave the animus. Then get right back in. When I loaded back in dude was ready to fight. Hope this helps!