Import with Milestones Failing

Summary

When importing a project with Milestones into Gitlab.com I get the following error.

The repository could not be imported.

Error importing repository into **cloud/research/feature-design - Validation failed: Title already being used for another group or project milestone.

Steps to reproduce

Seems to be a problem with select projects. Some projects with Milestones were successful.

Note. The Milestones do not exist in the import group.

What is the expected correct behavior?

Successful Import

Output of checks

This bug happens on GitLab.com

Results of GitLab environment info