Problem with start_substring in Figure_understanding notebook

Hi everyone,
in the Figure_understanding notebook []( https://github.com/Azure-Samples/document-intelligence-code-samples/blob/main/Python(v4.0)/Retrieval_Augmented_Generation_(RAG)_samples/sample_figure_understanding.ipynb
)
you use the tag: start_substring ((figures/{idx})) to get the proper figure in the markdown. However in my case this tag does not appear at all. Only figure tag is present. Which version did you use for this implementation?