Issue Summary

Not all the time. Sometimes this corruption is seen and once seen can't be avoided.

This is reproducible on Data Center: Yes

Steps to Reproduce

1. Take an export of Confluence cloud space. 
2. Try to import it an another Confluence cloud via https://support.atlassian.com/confluence-cloud/docs/import-a-confluence-cloud-space/ 

Expected Results

Space should be imported properly 

Actual Results

The below exception is thrown during the import of the space

ERROR: insert or update on table "content" violates foreign key constraint "fk_content_lastmodifier"Detail: Key (lastmodifier)=(aaaaaaaaaaaaaa) is not present in table "user_mapping". 

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available. 

Please reach out to Atlassian Support for guidance in such matters