Cannot remove artifact from releases in web UI

Hi guys,
when I try to delete an artifact from the the web UI of a Mender 3.0 server, it says there was an error because the artifact is in use by an active deployment. The problem is that there is not a deploy with that artifact.

However, I called the server APIs with Postman, and, while I can correctly see the artifact in the response of

GET /api/management/v1/deployments/deployments/releases

     {
        "Name": "ch-labels-dev-12-30",
        "Artifacts": [
            {
                "id": "9e070a57-a610-4cdc-9234-540b626578e9",
                "name": "ch-labels-dev-12-30",
                "device_types_compatible": [
                    "raspberrypi4-64"
                ],
                "info": {
                    "format": "mender",
                    "version": 3
                },
                "signed": false,
                "updates": [
                    {
                        "type_info": {
                            "type": "rootfs-image"
                        },
                        "files": [
                            {
                                "name": "custom-image-update-raspberrypi4-64.ext4",
                                "checksum": "aa05a5ef5c1aa1f52cb40fc201d981cbcba71afac83609941790ce25ea97e410",
                                "size": 2541748224,
                                "date": "2021-09-09T10:57:17Z"
                            }
                        ]
                    }
                ],
                "artifact_provides": {
                    "artifact_name": "ch-labels-dev-12-30",
                    "rootfs-image.version": "ch-labels-dev-12-30"
                },
                "artifact_depends": {
                    "device_type": [
                        "raspberrypi4-64"
                    ]
                },
                "clears_artifact_provides": [
                    "artifact_group",
                    "rootfs_image_checksum",
                    "rootfs-image.*"
                ],
                "size": 300002304,
                "modified": "2021-09-09T11:59:37.995Z"
            }
        ]
    },

I cannot find any deployment involving this artifact with id 9e070a57-a610-4cdc-9234-540b626578e9 in the response of

GET /api/management/v1/deployments/deployments

I also tried to delete the artifact by calling

DELETE /api/management/v1/deployments/artifacts/9e070a57-a610-4cdc-9234-540b626578e9

but fails with a status 409 saying

{ 
    "error": "Artifact is used in active deployment", 
    "request_id": "690d14ac-24be-476c-a2bf-896dffad1c01"
}

Maybe something in the DB got corrupted in some way? How can I remove this artifact?