Duplicate nodes and Inkscape crashes in XML Editor

Steps to reproduce:

1. Open an existing SVG document with at least 3 paths at the same level as each other, in Inkscape.
2. Move one node into another node, by click-drag-releasing it directly on top of the other (this should make one node a parent node with a plus sign, and the other a child node).
3. Do the same again with a third node, dragging it and releasing on top of the child node created in step 2 (there should now be a node at least two levels deep in the tree). We will call this the grandchild node of the first parent.
4. Click on the "Unindent node" button at the top of the XML Editor panel. Note that it does not move the node back up the tree, and instead creates a duplicate node one level up, appearing underneath.
5. Try moving the grandchild node anywhere in the tree (not the duplicate).

What happened?

After step 4, a duplicate node appears. After step 5, Inkscape crashes.

What should have happened?

After step 4, the grandchild node should have moved back up the tree.

Inkscape Version and Operating System:

• Inkscape Version: Inkscape 0.92.4 (5da689c313, 2019-01-14)
• Operating System: Windows
• Operating System version: 8.1 64-bit

May be related to this issue