I was supposed to visit the Moonlit Shrine for the main quest, but instead I first went to The Sand of Storms for a sidequest. I found a weird stone on a pedestal and it was clickable, so I clicked it.
Suddently the mainquest changed and now I don’t have to go to Moonlit Shrine anymore. In the questlog 4 checkmarks are checked at
“Find the Moonlit Shrine”
“Speak with Architect Liath”
“Inspect the altars in the Moonlit shrine”
“Find the Moon fragment hidden in the Strand of Storms on the west side of the island”
So, I’m guessing I found a Moon fragment and clicked it, even though I was supposed to go to Moonlit shrine first. I think it is a bug and the fragment should not have been interactable.