It can be a problem with a too small value of max_execution_time. If your sitemap is too large, there is no enough time to generate it fully. Thus the document breaks in the middle.
You can add ini_set('max_execution_time', 10); in wp-config.php or add max_execution_time = 1 in php.ini
Also, problem can be with extrace space before <?php or after ?> in your functions.php file
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