Not sure if anyone else experienced this but I’m currently on a fresh install (PC) no mods version 1.8 with all the dlcs and I’ve noticed every time it shows in the top corner a new codex entry unlocked it doesn’t actually show up in the codex itself. I’m still in Skalitz and hesitant to move forward just in case. Any help would be appreciated
I finished the game, did all possible quests, and still are some entries missing, not just in tutorial section. Probably a bug.
But you can full codex browse here 
https://kingdomcomecodex.github.io
Do you think it will be fixed anytime soon?