Typo3 RSS Feed has no items

Question

I've got a problem with the integration of a RSS feed on my website. I am working with the extension News System, which has the feature RSS Feed included.

On the list view of my news page I put in the following template (content from setup area). I've replaced paths and other sensible data with [...].

plugin.tx_news {
  view {
    templateRootPath = [...]
    partialRootPath = [...]
    layoutRootPath = [...]
  }

  settings.cssFile >
  skipControllerAndAction = 1
}

[globalVar = TSFE:type = 9818]
config {
    disableAllHeaderCode = 1
    xhtml_cleaning = none
    admPanel = 0
    debug = 0
    disablePrefixComment = 1
    metaCharset = utf-8
    additionalHeaders.10.header = Content-Type:application/rss+xml;charset=utf-8
    absRefPrefix = https://www.slawitscheck.at/bmw/news/
    linkVars >
}

pageNewsRSS = PAGE
pageNewsRSS {
    typeNum = 9818
    10 < tt_content.list.20.news_pi1
    10 {
            switchableControllerActions {
                    News {
                            1 = list
                    }
            }
            settings < plugin.tx_news.settings
            settings {
                    categories = 1
                    categoryConjunction = OR
                    limit = 30
                    detailPid = [...]
                    startingpoint = [...]
                    format = xml
                    list.rss.channel {
                      title = Slawitscheck BMW: RSS Feed
                      link = https://www.slawitscheck.at/bmw/news/
                      description = Ihr RSS Feed für alle News rund um die H. Slawitscheck GmbH. ► BMW, Mini, Neu- und Gebrauchtwägen, Service-Angebote und vieles mehr..
                      copyright = H. Slawitscheck GmbH
                      language = de-DE
                      generator = TYPO3 EXT:news
                      category = 1
                    }
            }
    }
}

[global]

detailPid is the ID of my news detail apge and the startingpoint is the ID of my News page. So https://www.slawitscheck.at/bmw/news/.

On this page only news with category 1 are shown, so that's why I put category 1 also in the setup. I only want category 1 news in my rss feed.

I edited the List.html so that I've got this link for the rss feed in the head of my page:

<link rel="alternate" type="application/rss+xml" title="RSS 2.0" href="/bmw/news/?type=9818">

Okay, so when I open the feed in a RSS reader (tried several different ones), the feed shows up as valid but it has no items! The feed is empty, althought there are news items with category 1.

News are not Set. In the NewsController in listAction() the value for 'news' is always empty. For the RSS Feed but not for the News-Page.

That's the link directly to the RSS feed: https://www.slawitscheck.at/bmw/news/?type=9818

The info I put in the template is set correctly, I just don't have any items. I didn't change the Typo3-Template for the RSS Feed (List.xml).

I already googled this, but unfortunately I can't find a solution for this problem.

Edit

Here is a screenshot of the Tree from pageNewsRSS! :)

1:

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3: