fern islands

So, I've looked at multiple guides and videos for the buried walnuts but no matter what I do nothing is working in any of the dig spots shown. I've been at this for a few hours now and I'm really starting to give up here, is there anyone who can tell me what's wrong?

I am a switch player, so when the new update came out of course I made a new file so I could experience it. I just got to the new island and it's mostly fine. Except for the North path that leads to the volcano. It's blue. Not everything, just the ground is blue. No textures show, though the...