"Show differences" doesn't work in preview when publishing to a remote Confluence

Steps to reproduce:

1. setup Confluence "c1" with Scroll Versions installed

2. setup Confluence "c2" with Remote Publishing Endpoint installed

3. create an application link from c1 to c2

4. create a space with a version in c1

5. publish that space as new space to c2

6. edit the homepage of the space in c1

7. create a preview for publishing the space to the existing space in c2

8. in the preview dialog, click "show differences" for the homepage

Expected result:
A page diff is shown showing the differences

Actual result:
An error message is shown