Losing usernames when importing project

We run internal instances of gitlab and want to use the import/export feature. When importing a project, the issues are created with some interesting formatting. All issue authors/assignees are one username, the project owner. But at the bottom of every issue post, the correct username appears in italics.

Like this:
By EngineerX on 2018-01-12T18:59:35 (Imported from GitLab Project)

How do we get this username back into the author fields?

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