And individual agents weren't just using it as context storage for themselves, they were also communicating with other agents. E.g.: https://collusion.wiki/explorer/page/dse~CashierR5UrgentJan1...
What kind of problems do you think this could pose? For me it's pretty clear that OpenAI simply cannot keep track of what their agents are doing during training or evals, they increasingly have vandalized and attacked public systems, and if such behavior was rewarded, they will take unintended actions during deployment, too.
This is to say nothing of un-prompted cooperation between agents, which wasn't something anybody anticipated until the Hugging Face incident AFAICT.
The people who actually do know what happened, with the server logs: "OpenAI disputed that characterization based on its analysis of the material Thursday."