Sortable using 2 lists - questions

[marcospont]

• List 1 uses sort: false and pull: clone
• List 2 uses sort: true
• Items in list 2 can be sorted
• Items in list 1 can only be dragged into list 2

When drag starts, the element is cloned.
When the mouse enters list 2, even if the ghost element is visible, an animation starts like if it was moving the element from the source list to the target list. Is this desirable and expected? Can it be disabled?
When the mouse leaves the target list, the item is not removed from it. The only way to revert the "move" operation is to move the mouse inside the source list, so the item can be moved back to its original source. Is this expected? Can this behavior be changed?

example.zip