[codeviking]

Yup, this is a known limitation:

> What are the limitations? There are several known limitations. Tables are currently extracted from PDFs as images, which are not accessible. Mathematical content is either extracted with low fidelity or not being extracted at all from PDFs. Processing of LaTeX source and PubMed Central XML may lack some of the features implemented for PDF processing. We are working to improve these components, but please let us know if you would like some of these features prioritized over others.

But we intend to fix this!