SortableJS Tree List - Re-homing Nested Items

I would like to move item “music” and make it a child of the second “workspace”.

Observe, music can be moved to a new sibling location.

However, I must “open” the workspace item, in order to make music its child.

If a node is a leaf, same problem: I have to click the leaf first, in order to “expose its dragArea”.

Anyone know how to fix this? (A repo is available if that will help.)