Issue Summary

Image captions are not visible when previewing an old page version.

Steps to Reproduce

1. Create a page and add an image as an attachment.  Publish the page.
2. Edit the page and add a caption for the attached image. Publish the page.
3. Edit the page again and change or remove the image caption.  Publish the page.
4. On the view screen, navigate to "..." -> "Page History"
5. Select the the version with the caption and click on the version to preview it.

Expected Results

The old caption will show up under the image.

Actual Results

No captions show up under any images, whether they had image captions or not.

Workaround

Revert to the old page version, then view it.  The old image caption will be visible.  Afterwards, revert back to your intended page version.