The main quest called The Monastery will stop at step "Inspect the Structure" if you do following:
- Go to the Mausoleum location and sit on bench to wait for moon
- Immediately solve the rune puzzle, by clicking on the center and right pillar. Do not click on the rune stone below the pillars to get the hint.
- A cutscene with Kythaela will show up, but the quest line will not progress
Even thought Kythaela is released, the following steps in quest do not trigger. I guess after the cutscene with Kythaela there should be a step to trigger "Find the Copper Vale of Remembrance" otherwise the main questline cannot be progressed.