Am I missing something?

Spoiler warning!!! I finally got to the quantum moon. Took me hours, but I finally got there. I used the 3 rules and got to discover what I think the sixth location is. Am I missing something. Was the sixth location not just the dark bramble lookalike with all the tree roots and dead nomai and stuff or was there more to that area that I missed. I’m getting a pretty good idea that I have to go to Dark bramble and replace the core there, but my sixth location rumour is still in a Question mark. So essentially, do I have to go back there and explore something I missed or am I good to continue. The sixth location is my last thing I have undiscovered on my rumour map.

I feel like this is a really dumb question but who cares lol. And ofc if possible, tell me in a hintful way if I’m wrong and I’ll go back and try some more.