title: TYPO3: FCE tab shows more elements than actual template files
body: <p>I have a wierd problem, which I'm unable to find the root of.
  I have my own extension installed adding custom fluid content elements (fce). In the FCE tab (when adding new content element to page) I have two more elements selectable than actual template files. But it's getting wierder both extra elements have no label and throw an error when I try to add them.</p>
  
  <p>The structure is:</p>
  
  <pre><code>typo3conf
    └ ext
       └ my_fancy_extension
          ├ Configuration
          │  └ TypoScript
          │     └ setup.txt
          ├ Resources
          │  ├ Privat
          │  │  ├ Elements (... containing my template files)
          │  │  ├ Language (... containing only my locallang.xml file)
          │  │  └ Elements (... containing only one partial file)
          │  └ Public
          │     └ [...]
          └ [...]
  </code></pre>
  
  <p>I digged down page TSConfig in the BackEnd and found out that the one partial file and the one language file are "loaded" as template files.</p>
  
  <p>But I set <code>my_fancy_extension/Configuration/TypoScript/setup.txt</code>:</p>
  
  <pre><code>plugin.tx_fed.fce.my_fancy_extension {
      templateRootPath = EXT:my_fancy_extension/Resources/Private/Elements/
      partialRootPath = EXT:my_fancy_extension/Resources/Private/Partials/
      layoutRootPath = EXT:fluidcontent/Resources/Private/Layouts/
  }
  </code></pre>
  
  <p>... and made sure this file was included in <code>fileadmin\default\ts\setup.ts</code>.
  But it seems not the templates from <code>./Elements</code> are loaded, but all files below the parent folder <code>../Privat</code>.</p>
  
  <p>I'm not this adept with TYPO3 and TypoScript yet, but I'm learning since a year now. This is the first time I ran in something like that and I don't know where to dig further...</p>
  
  <p>Does anyone know an approach? If you need more information, please let me know.</p>
  
  <p>Thanks in advance and best regards.</p>