The mural of prophecy and mural of experience from the 2nd to 5th can't be acquired after I accomplished the story. Please fix help me and fix it

Hi, I had the same issue too. But I figured it out and it's not a bug.
It's a side story and you can access it at any level after finishing the main quests in the chamber. I put up screenshots to help. Here's how to access it:
1- Open menu and click on 'Story'
2- Farthest left story is 'Ancient Murals'. At the bottom of that story is a 'Learn More' button. Click 'Learn More'.
3- The next screen shows a list of quests beginning with 'What the ancients left behind'. Right next to it is a 'Accept' button. Click 'Accept'.
When you finish that quest, the next quests will automatically start one after the other till you finish all of them and gain that knowledge you missed out on (Mural of Prophecy and Mural of Experience).
Hope I helped and good luck.

Dude, TY so much for this, very helpful info