When starting from a Blank site, the default code inserted for the Content Template includes a restrictive <title> element:
<!DOCTYPE html>
<html>
<head>
<title>{{ this['name'] }}</title>
</head>
<body>
{{ pageContent }}
</body>
</html>
I’d suggest removing the <title> element altogether since the system now handles document titles automatically and in accordance with the Name or Meta Title value.