Neal Stephenson's Anathem had a thing called "bogons" which were purposely misleading datasets. Apparently the https://anathem.fandom.com/wiki/Reticulum https:

Neal Stephenson's Anathem had a thing called "bogons" which were purposely misleading datasets. Apparently the https://anathem.fandom.com/wiki/Reticulum https://anathem.fandom.com/wiki/Reticulum was full of them, you basically had to have a specialist along for the ride if you wanted to hook into the version which wasn't a lie. It thematically relevant to the story, but it was never explained how they got there. I've been looking for a plausible explanation. I think I just found it.