New LLM Intent Matching - NO MATCH ?

I'm probably missing something here! I just switched over to the LLM Intent Classification. I used to rely on a No Match path being routed to the knowledge base when all my intents hit a low confidence. This LLM intent matching is acting like it HAS to pick an intent even when there isn't a good match, whereas before with NLU, if the confidence score was low, it would go through a Nomatch path. What am I missing?