My apologies for not grabbing a screenshot, I was too invested in my playthrough and didn't stop at the time!

There was a territory adjacent to my own containing a natural wonder that I was the first to discover. An AI claimed it, and this action generated two demands, one for claiming a territory adjacent to my own and one for claiming a territory containing a natural wonder that I discovered. Both demands had the same goal: take the territory. After sending one demand to the AI, the other remained a possibility, but its buttons were grayed out. Hovering over, the tooltip contained red error text that looked to my eyes like a string id with a missing localization entry, describing the situation of overlapping demands. I'm not sure if its intended behavior and just a missing string or if the presence of the demand itself was a bug.