try the markup:

{chart:title=Confluence content By \\ type|type=line|dataDisplay=true|width=1100|height=400|legend=true|dataOrientation=vertical|ylabel=Count} {sql:dataSource=sqlmacro|output=wiki}
select contenttype, count from content
group by contenttype{sql}{chart}

export the page to PDF – javascript is shown after the table.

This may be a problem due to not handling comments correctly?