Strange Pictures question

Hi everyone,
I recently finished Strange Pictures and loved it - the tension, the mystery, everything about it is brilliant. That said, there’s a detail I can’t quite reconcile, and I’m curious if anyone else has thought about it (or if there’s context I’m missing). Spoilers ahead.
The issue: At one point, Iwata tells Yuki that he plans to recreate the camping trip that very night — just a few hours later. Later, Yuki supposedly tells Naomi about Iwata’s investigation “a little while back,” which reads to me as some earlier time, not immediately. But then Naomi seems to know the very night about Iwata’s plan to be at the campsite, enough to anticipate him and act on it.
It seems like the timeline is too tight for Naomi to have gotten that information in time. Unless Yuki rushed to tell her in the same few hours (which the text doesn’t really support), it feels like a logical gap.
Has anyone else noticed this? Is there something I might have missed, or does it seem like a small plot hole? I’d love to hear your thoughts or interpretations.
Thanks!