Stable SortableContext issue

[sno6]

I just ran into an issue that is perfectly summarised here.

You essentially get to re-order your list of items once and then it stops working. The problem is something to do with SortableContext, and the solution is to trigger it to remount (?) by passing in a different key.

As this took several hours to discover and is incredibly non-obvious I feel like an issue should be made. At the very least I would love to learn why this is occurring.