TYPO3 Core

The behavior only occurs if you move an element in a workspace over another element that is already present in Live and the calculated new sort number is not smaller than that of the subsequent element. In this case, a function is called which should increase the sort number of the subsequent element. However, as workspace is enabled for tt_content, t3ver_oid = 0 is appended to the query. As the subsequent element in the t3ver_oid column has a reference to the live element, this is not updated and the sort number is not increased and therefore the order is not adjusted. This makes it appear to the user as if nothing is changing.

Described function: TYPO3\CMS\Core\DataHandling::increaseSortingOfFollowingRecords