Error when bulk deleting runners in gitlab.com

I enabled #361721 (closed) for the gitlab groups and one test group at: https://gitlab.com/groups/runner-group-test during our rollout at #378090 (comment 1151422185).

Unfortunately I was not able to delete due to an API error:

[
  {
    "operationName": "bulkRunnerDelete",
    "variables": {
      "input": {
        "ids": [
          "gid://gitlab/Ci::Runner/18514162"
        ]
      }
    },
    "query": "mutation bulkRunnerDelete($input: BulkRunnerDeleteInput!) {\n  bulkRunnerDelete(input: $input) {\n    deletedIds\n    errors\n    __typename\n  }\n}\n"
  }
]

[
  {
    "data": {
      "bulkRunnerDelete": null
    },
    "errors": [
      {
        "message": "The resource that you are attempting to access does not exist or you don't have permission to perform this action",
        "locations": [
          {
            "line": 2,
            "column": 3
          }
        ],
        "path": [
          "bulkRunnerDelete"
        ]
      }
    ]
  }
]