English Wikivoyage pages with the pagebanner extension enabled are not setting the HTML <title> tag correctly. See for example https://en.wikivoyage.org/wiki/Yosemite_National_Park - the title should be "Yosemite National Park – Travel guide at Wikivoyage", but it is just "Yosemite National Park".
The MediaWiki:Pagetitle value is "$1 – Travel guide at {{SITENAME}}" - https://en.wikivoyage.org/wiki/MediaWiki:Pagetitle.
Mainspace pages without page banners have their title tags set correctly - see https://en.wikivoyage.org/wiki/Previous_Featured_travel_topics which has a title of "Previous Featured travel topics – Travel guide at Wikivoyage".
This bug has serious SEO implications, so any attention would be much appreciated.