RevisionDocumentNotFound when scoring new pages

[he7d3r]

It seems revscoring is not able to score new pages:
http://ores.wmflabs.org/scores/ptwiki/?models=reverted&revids=42835908|40200979

{
  "40200979": {
    "reverted": {
      "error": {
        "message": "Failed to process <parent_revision.metadata>: RevisionDocumentNotFound",
        "type": "<class 'revscoring.dependencies.errors.DependencyError'>"
      }
    }
  },
  "42835908": {
    "reverted": {
      "error": {
        "message": "Failed to process <parent_revision.metadata>: RevisionDocumentNotFound",
        "type": "<class 'revscoring.dependencies.errors.DependencyError'>"
      }
    }
  }
}