saver/runner fails to get test-file metrics

[JonJagger]

runner/reports/server/coverage_metrics.json

{
  "timestamp": 1763991433,
  "command_name": "Minitest",
  "groups": {
    "test": {
      "lines": {
        "total": 0,
        "covered": 0,
        "missed": 0
      },
      "branches": {
        "total": 0,
        "covered": 0,
        "missed": 0
      }
    },
    "app": {
      "lines": {
        "total": 549,
        "covered": 272,
        "missed": 277
      },
      "branches": {
        "total": 66,
        "covered": 2,
        "missed": 64
      }
    }
  }
}

So tests are not being seen. I think this happened when runner/source and runner/test became sibling dirs.