TYPO3 Core

I used the suggest search in my extension in the plugin flexform definition:

<pages>
  <TCEforms>
    <exclude>1</exclude>
    <label>LLL:EXT:lang/locallang_general.php:LGL.startingpoint</label>
    <config>
      <type>group</type>
      <internal_type>db</internal_type>
      <allowed>pages</allowed>
      <size>3</size>
      <maxitems>99</maxitems>
      <minitems>1</minitems>
      <show_thumbs>1</show_thumbs>
      <wizards>
        <suggest>
          <type>suggest</type>
        </suggest>
      </wizards>
    </config>
  </TCEforms>
</pages>

If I have not saved the content element, I can't find any page in the suggest search. After I save the content element, every page is found. Also in TYPO3 version 4.5.28 is the same problem.