Merge Request Security Report endpoints returning HTTP 204

The Dependency Scanning report for Merge Requests is returning HTTP 204. This is happening in Staging currently with the dependency_scanning_merge_request_report_api feature flag turned on.

The problem is happening at https://staging.gitlab.com/secure-team-test/dependency-list-test/merge_requests/1 The security report widget reports Security scanning (is loading) detected no vulnerabilities for the source branch only

Going to that MR and viewing the network traffic, you will see multiple requests to https://staging.gitlab.com/secure-team-test/dependency-list-test/merge_requests/1/dependency_scanning_reports that result in the HTTP 204.

It has not been confirmed, but I suspect the problem will be the same for sast, dast, and container_scanning reports as well.