I think your prompt is bad. Still impressive that Claude 3.7 handled your bad prompt, but qwen3 had no problem with this prompt:

Create a Python decorator that registers functions as handlers for MQTT topic patterns (including + and # wildcards). Internally, use a trie to store the topic patterns and match incoming topic strings to the correct handlers. Provide an example showing how to register multiple handlers and dispatch a message to the correct one based on an incoming topic.