Since a week or a few of them, the stop button has been broken for me. It appears to work, as it will immediately cause new reply text to stop disappearing and enable the user message input field. But when I send the next message quickly, I get a “one response at a time” error. Reloading the browser causes both the aborted ChatGPT response and my next message to disappear.
Stopping a reply, not sending a message, and then refreshing a while later, reveals the full, non-stopped reply that was generated after all.