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And when I play as Aegon in war of conquest, after 8011, the chronicle stops reporting events, am I the only one who is experiencing this?
No, I had the same thing happen to mean in a Blackfyre game. The chronicle just stopped updating after a decade or so.
 
From my experience, and I've only started using the Chronicles in the last couple games I've had (Only realized they were there now within the last couple months) I've noticed that in time periods where I was playing a certain character (Example: Aegon the Conqueror) and switched to another ruler (Orys) I don't get chronicle updates till after that initial ruler dies. Then the game proceeds like normal.

I once didn't have any chronicles from 8020 to 8065 before they picked up, then I started getting them like crazy.