Quest[spoken and unspoken] is stuck and can't continue

I came here and talked to the npc before I got the old leather tome. And when I got the old leather tome the item fell to the ground because the rune backpack was full.

But now even if I had the book, the quest couldn’t continue.

I have the same issue here. I don’t think it was because of the full pack but anyway I have the tome but cannot trigger the dialogue to continue.

Please fix asap because this is stopping me proceeding with the storyline

The problem still remains