Exception when closing a page without saving in a published space

Steps to reproduce:

1. Create a space with initial version in Source (Duplicate Pagetitles feature is activated)

2. Create a new space in Target

3. Publish the space to existing space in Target

4. Open any page in Target → Edit → Close → Discard without saving

Expected result:
A page as displayed as before a user started editing

Actual result:
Exception is displayed

Additional notes:
The issue is not reproducible when publishing to a new space

Workaround:
If Target has Scroll Versions installed, you can use this workaround.

1. After step #2 open the created space → Space Tools → Space Add-ons

2. Go to Advanced Settings → click on Manage Settings → enabled Duplicate Pagetitles → click Save

3. Click on Manage Settings again → disabled Duplicate Pagetitles → click Save

4. Publish to this existing space