Reported by @fair pine
First, send a message in a conversation.
Then, either edit your own message or click the “Try again” option on the AI’s response.
Previous versions of the message or response should remain accessible. Normally, the UI displays a version indicator (for example, “<2/2>”) that allows you to switch between different versions, effectively acting as conversation branches within the same chat.
The version indicator no longer appears. Only the most recent version of the message or response is visible, and earlier branches are no longer accessible.
Tested in the browser and Windows app versions of ChatGPT. (The mobile version never had this feature, so it's unaffected) (Also, thank you ChatGPT for helping me word this in a way that hopefully makes sense)