Hi team,
Shortcodes (eg the native [sitetree_link id=123]) don't appear to be evaluated inside RSS feeds, they're served as raw text.
This can be fixed in Text::AbsoluteLinks() which is called in RSSFeed.ss:
sapphire/core/model/fieldtypes/Text.php#77
by changing:
return HTTP::absoluteURLs($this->value);
to:
return HTTP::absoluteURLs($this->forTemplate());
Cheers, Matt