QTextDocument cannot handle bidirectional control characters

When wrapping a part of a text with a bidirectional control native mark, all Latin letters have a Ceasar shift of -2 (ROT-2).

Following code snippet shows: "?@AVWX" instead of "ABC XYZ"

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QTextCursor cur = ...
const QString nativeMark = QString::fromUtf8( "\xe2\x80\x8e" );
cur.insertHtml("<b>"+ nativeMark + "ABC XYZ" + nativeMark + "</b>");

It seems that if I mark the text and copy paste the string somewhere else, the correct string is pasted.