Okay, this is driving me nuts.
There are three places you're supposed to be able to see an NPC called Strange Kodan: Kodan Shipwreck, Kodan's Leap and Whisperwind Grotto. Seen him at Whisperwind Grotto, and got the Shadows Creep achieve there.
But never seen anything at Kodan's Leap - and at Kodan Shipwreck at night, I can see the hammer and chisel moving and carving on the wall, but no Strange Kodan holding them, and no Curious Carving or Kodan to interact with to get the dialogue.
Aside from going there at night, are there any other prerequisites for seeing the Strange Kodan at Kodan Shipwreck?