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When using the RSS Feed formatter, nodes are rendered using node_build_content(). This function skips the node_view_alter() hook (and entity_view_alter()), which contrib modules can use to modify the output of elements in Drupal Core (e.g. i18n uses this to modify/add translation links, as far as I know). As a result, the RSS feeds generated by Views differ from the Core feeds, mostly because these hooks are not executed.
I propose using node_view() instead of node_build_content() to get the actual contents to be shown in an RSS feed. This should make nodes render equally to Drupal core (node_feed() in node.module), which uses the same function (and executes the alter hooks). Attached patch should do this.