Backend search shows invalid search results
When searching in list module for a nowhere existing word, e.g. "somenotexistingwordfoobar", I get results nevertheless: All "website language" (sys_language) records are anyways displayed. If some extensions are installed, the records of these extensions are also returned. Have a look at attached image.
When adding "searchFields" with at least one field to TCA, all is ok. Example for the website language records:
$GLOBALS['TCA']['sys_language']['ctrl']['searchFields'] = 'title';
But sometimes you don't want to define searchFields.