Some ComfyUI builds don't reliably submit optional widget values to execute(), leaving format='{}' (default) and emitting raw int strings via index_str. Moving format to required guarantees the user-entered template reaches the Python side.
Some ComfyUI builds don't reliably submit optional widget values to execute(), leaving format='{}' (default) and emitting raw int strings via index_str. Moving format to required guarantees the user-entered template reaches the Python side.