Can't use wide characters as password mask character

Trying to use a wide character as PasswordMaskCharacter does not work.

case QPlatformTheme::PasswordMaskCharacter:
    return QChar(0x1F648);

This affects both QtQuick Controls TextField and QWidget QLineEdit.

Setting the passwordCharacter property on a TextInput exhibits the same behavior as doing so via themeHint.

Using a QString which can actually hold a character this wide doesn't work either.