'Invalid content type' error during CI pipelines import for a project Direct Transfer

A migration of 100 projects 1 project had 'invalid content type' when trying to download ci pipelines export from source:

• https://staging.gitlab.com/api/v4/bulk_imports/1029976/entities/1040670
• https://gitlab.com/gitlab-migration-large-import-test/multiple-projects/imported-project-f5fc50ea60f3dbde
• https://staging.gitlab.com/georgekoltsov-multiple-projects-test/multiple-projects/imported-project-f5fc50ea60f3dbde

It looks like the destination project has pipelines, so they were imported after all.

Investigate:

• Why the error occurred
• Since pipelines are imported, did the retry kick in and make pipelines import complete?
• If retry kicked in, there's no need for such error to be captured