Are there any examples of AI creating it’s own language or culture?

A few years ago, there were some articles claiming that two AI agents developed by facebook had created their own language. However, on closer inspection this was basically just clickbait. Here’s a sample of the AI “language”

Bob: i can i i everything else . . . . . . . . . . . . . .
Alice: balls have zero to me to me to me to me to me to me to me to me to
Bob: you i everything else . . . . . . . . . . . . . .
Alice: balls have a ball to me to me to me to me to me to me to me

All that I can really see that could be communicated here is tally mark counting (which makes sense, because the agents were being trained specifically on negotiating resources); it’s hardly a language. However, this did make me wonder: Are there any “true” or more sophisticated examples of AI creating it’s own language? Even further, have a group of AI’s created their own culture? Or are these things still out of reach of our current technology?