Vector store indexing is currently not completing/hanging

I’m seeing files hanging in in_progress for over an hour, and one finally completed with an error:

    {
      "id": "...",
      "object": "vector_store.file",
      "usage_bytes": 0,
      "created_at": 1776293392,
      "vector_store_id": "...",
      "status": "failed",
      "last_error": {
        "code": "server_error",
        "message": "An internal error occurred."
      },
      "chunking_strategy": {
        "type": "static",
        "static": {
          "max_chunk_size_tokens": 800,
          "chunk_overlap_tokens": 400
        }
      },
      "attributes": {}
    }