Summary

Page Tree macro's "Root page" field resets to the root of Space when editing it after publishing the page with the non-root page as "root page" in the macro.

Steps to reproduce

1. Create a page and use the Page tree macro.
2. Put a non-root page in the macro config.
3. Publish the page.
4. Edit the page and edit the macro again.
5. You will see that value in the Root page field is gone. Click in the Root page field.
6. Click in the field and publish the page again and you should see that macro is published with Root of the space.