Comparing changes in Preview doesn't work when publishing to remote instance

Prerequisite:
Two Confluence instances: one with Versions, the other one with Remote Endpoint

Steps to reproduce:

1. Create a space in the master instance -> add a space version,

2. publish the space to the remote instance (publish to new),

3. edit the page on the master instance -> change the content,

4. open publish to existing space dialogue -> Preview -> click on Show differences

Expected result:
a difference in content is shown

Actual result:
unknown error loading page diff is displayed