We have a 2.0.0-alpha.7 setup working perfectly fine. We'd like to update to 2.0.0-alpha.9, but the container systematically fails to apply metadata:

FATA[0000] failed to apply metadata:
{
  "path": "$.metadata",
  "error": "key \"sources\" not found",
  "code": "parse-failed"
}

There is no column, table or anything named "sources" in our metadata/database schema. I've no idea where this bug comes from, but it prevents us to update. It also happens when updating to 2.0.0-alpha.8.