ShadowDOM - Sorting still buggy in 0.5.0

Continuation of previous issue #1765

Sorting between lists within a shadow-dom is still problematic. As far as i can tell, the move helper is the main culprit, since simple single list sorting works perfectly when move() isnt invoked (as evidenced in the sandbox with the column sorting).

Strangely, it does seem to function fine when decreasing the item's indexation (moving to earlier in the list), but breaks when moving it later in the list.

I've modified the sandbox to use a shadow-dom so you can see what's happening.
https://codesandbox.io/p/sandbox/p7r9tj

Start with the linked CodeSandbox reproduction and compare the cross-list ShadowDOM behavior when move() is invoked with moves to earlier versus later indexes. Read previous issue #1765 for context, then verify that sorting between ShadowDOM lists works in both directions without breaking single-list sorting.

Written by the indexing model from the issue text.