[experimental] Janky autoscroll with multiple vertical sortable lists

Hey! Great work, thanks for that.

This is a very specific bug:

- Multiple sortable lists;
- Must be vertically aligned;
- Lists must be tall (the taller, the jankier);

Sorting items works like a charm. Sorting lists is janky, but only when sorting up. Sometimes the transformations seem to get messy too after a while, but I guess the main culprit is the autoscroll.

Here's a [reproduction](https://codesandbox.io/p/sandbox/condescending-joji-pq3m9l) and here's a video:

https://github.com/user-attachments/assets/78bd41f1-9a6c-49ad-86d4-f912ac574562