[Bug] Cannot submit comment review - HTTP 500 error on drafts/publish endpoint

Summary

Unable to submit comment review on merge request. Getting HTTP 500 Internal Server Error when calling the drafts/publish endpoint.

Steps to reproduce

1. Navigate to merge request #2581 (closed) at https://gitlab.com/itcareplus/cis-api/-/merge_requests/2581
2. Start a review by adding comments to code changes
3. Select "Request changes" as reviewer state
4. Click "Submit review" button
5. Observe HTTP 500 error response

Current behavior

• API call to /drafts/publish endpoint fails with HTTP 500 Internal Server Error
• Review comments are not submitted and remain in draft state
• User receives generic error message without specific details
• Review workflow is blocked

Expected behavior

• Review should be submitted successfully with HTTP 200/201 response
• Comments should appear on the merge request
• Reviewer state should be updated to "requested_changes"
• User should receive confirmation of successful submission

Environment

• GitLab version: [Check in Help → About GitLab]
• Browser: [e.g., Chrome 91.0.4472.124]
• Operating System: [e.g., Windows 10, macOS 12.0, Ubuntu 20.04]
• GitLab instance: GitLab.com (SaaS)

Technical Details

API Endpoint: POST https://gitlab.com/itcareplus/cis-api/-/merge_requests/2581/drafts/publish

Request Payload:

{
    "noteable_id": 390599351,
    "note": "",
    "approve": false,
    "approval_password": "",
    "reviewer_state": "requested_changes"
}