Error 500 returned instead of 404 when book is not found

[nichwall]

Based on the API docs as December 26, 2024, a response of 404 should be returned if a book is not found by id (such as the ASIN).
https://audnex.us/#tag/Books/operation/getBookById

Currently, error code 500 is returned instead of a 400 or 404. Is this an error in the code or a documentation issue?

For example, sending a query to https://api.audnex.us/books/B0DRFZR5RL results in

    data: {
      statusCode: 500,
      error: 'Internal Server Error',
      message: "Item not available in region 'us' for ASIN: B0DRFZR5RL"
    }