When dragging (or using the keyboard) a draggable item between two droppable areas within a modal causes the screenreader focus issues. It announces the title of the page the modal is on. This is before the item has been dropped, making it impossible for a screenreader user to know what position the item is in.
I think it's related to the sensors, from logging it looks like the sensors are remounted when the draggable item enters a new container. I'm inclined to believe this is to do with dnd-kit and not my implementation because I'm able to replicate this in storybook.