get_csv download does not convert sparse ARFF format to CSV

When attempting to download a CSV data file, the Sparse_ARFF formatting does not get converted to proper CSV

e.g. Data https://www.openml.org/d/1432
has a download link
https://www.openml.org/data/get_csv/1426688/phpHwC8ck

All records are in sparse_arff format.
e.g. this is the first record:
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I believe this fragment of code from Data_server needs to be extended to decode the above rather than just echo it:

    $this->_header_download($file->filename_original, null, 'csv', 'text/plain');
    
    echo '"' . implode('","', $features) . "\"\n";
    for ($i = 0; ($line = fgets($handle)) !== false; ++$i) {
      if (trim($line[0]) == '%') {
        continue;
      } else {
        echo $line;
      }
    }

Start by reproducing the problem with the provided get_csv URL for dataset 1432 and inspect where that endpoint handles Sparse_ARFF data. Confirm that the response contains conventional CSV records rather than sparse ARFF syntax, including the first record shown in the issue.