Sorting of content and container elements in T3 V12 LTS does not work correctly #415
Description
If you have created various content elements in the backend and these are also container elements, the sorting no longer works correctly if many elements (for example 20) are created here. Without container elements - only with Typo3's own elements such as headings, text/media, images etc. - the sorting works correctly, but if container elements are also created there, the sorting goes crazy at some point. New elements (e.g. headline) are not placed in the desired position - for example at position 17. Every time the element is inserted at the top of the page and you can't move it to the desired position with drag'n'drop. Manual sorting via the list function also blocks with a large number of created components. I only get the desired element moved to position 13. It does not go any further down. The next time I click on the "Arrow down" button, the element moves back up to position 12. Cutting and pasting at the desired position does not work either. Even creating a new content element at the desired position does not work.
It would be really great if you could take a look at this.