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I do not know in which version this problem started, but I got a call from a customer telling me that it was not possible to order product variations in my webshop that had non ascii chars in the version name. It turned out when the select dropdown is reconstructed with the DOMDocument class it messes up the variation name encoding.
The fix for this issue if someone else has it is to edit includes/Frontend/Woo_Config.php and on line 248 change from
$dom->loadHTML($old_html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
To
$dom->loadHTML(mb_convert_encoding($old_html, ‘HTML-ENTITIES’, ‘UTF-8’), LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
It would be nice if you would fix this issue in the next version you release.