Standard field data from Jira issues macro not displayed during PDF export

When specifying what columns to display in the Jira issues macro, case is important. For example, if 'Summary' is used then the information will display on the page but not on a PDF/Word export of the page. However if 'summary' is entered then the information will appear on the page as well as the exports.

To Reproduce

1. Add a jira issues macro too a page
2. Enter 'Summary' in the 'columns' field
3. Save the macro
4. Export page to PDF or WORD and notice that the data for the summary column is missing in the export