Issue Summary

When a page contains multiple PDF macros, the preview does not work when refreshing the page. If we click on another page in the content tree and then go back to the affected page, the PDF loads.

We could observe two situations when the preview fails:
1. Using two sequences of Expand macro > PDF macro (nested macros);
2. Using a sequence of File attached > PDF macro.

If we move the PDFs out of the expand macros, they are presented when we refresh the page.
If the page only contains one expand with one PDF, the issue does not occur.

Steps to Reproduce

Testing on a test environment, could reproduce with a sample page following these steps:

• Add a expand macro (1)
  • Add PDF macro (1)
• Add another expand macro (2)
  • Add PDF macro (2)
• Publish the page - observe that you are able to see the content
• Refresh the page

Expected Results

• We should be able to see the PDF preview;
• Using the Javascript console, we can observe a successful message:

  VM253 com.atlassian.confluence.extra.officeconnector:mediaviewer-chunks.js:673 PDF successfully loaded
  

Actual Results

• it spins without load;
• Javascript console shows the error:

  VM814 com.atlassian.confluence.extra.officeconnector:mediaviewer-chunks.js:1 Error running batched script.
  VM814 com.atlassian.confluence.extra.officeconnector:mediaviewer-chunks.js:1 ReferenceError: webpackJsonpMediaViewer is not defined
  

Workaround

• click on any page from the tree;
• Then click on the page again - observe that now it loads fine.