500 server error when creating an MR on gitlab.com/gitlab/gitlab-org

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I am trying to create this merge request but it consistently returns a 500 server error after some moments:

https://gitlab.com/ptalbert/gitlab-org/-/merge_requests/new?merge_request[source_branch]=fix_commitsWithoutMergeCommits&merge_request[source_project_id]=28406787&merge_request[target_branch]=master&merge_request[target_project_id]=278964

I have tried via the command line git push -o merge_request.create option and it fails as well:

remote: ========================================================================
remote: 
remote:              WARNINGS: Error encountered with push options
remote:            'merge_request.create': An unknown error occurred
remote: 
remote: ========================================================================

This has been happening since yesterday. Is there something wrong with my account?

Thank you,

Patrick