Problems when Restoring a generated projectdoc Page

If the original generated Page from a projectdoc space is restored, the following error is rendered in the view:

java.lang.RuntimeException: Failure occured during migration of reverted page: Produkt-Backlogs v.1 (3276879)
at com.atlassian.confluence.pages.DefaultPageManager.rethrowMigrationExceptions(DefaultPageManager.java:1288)
...
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to com.atlassian.confluence.content.render.xhtml.model.resource.identifiers.ResourceIdentifier
at com.atlassian.confluence.content.render.xhtml.storage.macro.StorageMacroV2Marshaller.writeParameterValue(StorageMacroV2Marshaller.java:176)
...