shadow parcel
I had this issue once before on a hardcore world and assumed something spawned in the sky or underground so i just missed it before i could explore- but it just happened again, the atlas showed a village on my client, on my friend's client, the identical, copied atlas showed the marker i put there to point them to it, but the village house icons weren't visible on their side. When we walked there, there wasn't a village to be found. I don't know if this is anything for here or for the antique atlas itself but thought i'd report it either way! Screenshots will be added later when my friend can provide them.
steep fable
waxen fiber
fallen compass