The URL https://www.aksam.com.tr/guncel/baskan-erdogan-48inci-muhtarlar-toplantisinda-konusuyor/haber-795519 has:

<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-9" />
<meta http-equiv="Content-Type" content="text/html; charset=windows-1254" />

However res.textConverted() returns
<p>Cumhurba�kan� Recep Tayyip Erdo�an, Be�tepe'de 48'inci Muhtarlar Toplant�s�'nda konu�tu.</p> <p><strong><em>Erdo�an'�n a��klamalar�ndan sat�r ba�lar� ��yle:</em></strong></p>

I see that in body.js convertBody the charset is supposed to be detected. I think the reason is that Content-Type is uppercase, but the regex in body.js only matches lowercase. The preview str should be lowercased.