TYPO3 Core

After successfully publishing changes to the text body of a content element (see attachment Step 2), I tried to visit the list of changes in workspace view in BE in order to publish further changes (see attachment Step 3). Unfortunately the list stays empty. Inspecting the loading process with the developer tools of the browser shows, that there is a certain XHTML request failing (see attachement step 3a). Moreover there is an exception logged in the BE everytime one tries to view the list of changes (see attachment step 3c).

After inspecting the piece of code that throws the exception, I found some comments there, mentioning the reference index. So i tried updating the reference in BE (see attachment 4a) and suddenly the exception went away (see attachement 4c). So obviously there was still a reference to the published content element in the index table (see attachment 3b and 4b), that was causing the exception. Is this normal behaviour, the result of a wrong configuration of the workspaces or simply a bug in typo3 in workspace handling???