Yes - they all do that. Actually, most attempts start well but unravel toward the end.

  llm -m chutes/Qwen/Qwen3-Coder-480B-A35B-Instruct-FP8 \
  "An ASCII of spongebob"
  Here's an ASCII art of SpongeBob SquarePants:
  
  ```
      .--..--..--..--..--..--.
    .' \  (`._   (_)     _   \
  .'    |  '._)         (_)  |
  \ _.')\      .----..--.   /
  |(_.'  |    /    .-\-.  \
  \     0|    |   ( O| O) |
   |  _  |  .--.____.'._.-.
   /.' )  | (_.' .-'"`-. _.-._.-.--.-.
  / .''.  |  .' `-. .-'-. .-'"`-.`-._)
   .'.' |  |   |  |  |  |  |  |  |  |
  .'.'   |  |   |  |  |  |  |  |  |  |
  .'.'   |  |   |  |  |  |  |  |  |  |
  .'.'   |  |   |  |  |  |  |  |  |  |
  .'.'   |  |   |  |  |  |  |  |  |  |
  .'.'   |  |   |  |  |  |  |  |  |  |
  ```