They are autocomplete, they're just completing something in the form Assistant: ... User: ... Assistant: ... And the output is stopped when they start gener

They are autocomplete, they're just completing something in the form Assistant: ... User: ... Assistant: ... And the output is stopped when they start generating the equivalent of "User: " and the reins are handed back to you. This isn't a problem, autocomplete at the level of "what would a person say next" is outrageously powerful, but it is how they're working afaik.