Resized cells and impossible reordering in waterfall layout example

[numair]

Hi! In playing around with the third example, I find that there are times when I am not able to move a cell between two others, and times where the cells still get resized (I know there's a section at the end of the accompanying article detailing how some of the code for invalidationContextForInteractivelyMovingItems should prevent this from happening). Are these known issues? Are there any workarounds? Thanks for a great tutorial -- it remains some of the only useful documentation on this great new feature!