Unable to expand group after undo drag step in XML Editor

Steps to reproduce:

1. Open an SVG file consisting of at least one group element.
2. Open the XML Editor panel.
3. In the XML Editor panel, choose a group to move, and drag it to another location at the same level in the hierarchy/tree.
4. Undo the move by using either "Drag XML Subtree" from the Edit > Undo menu, or else Ctrl + Z key combination.
5. Try to expand the group by clicking the triangle to the left of the group.

What happened?

The triangle disappears. Unable to expand the group.

What should have happened?

Able to expand the group.

Inkscape Version and Operating System:

• Inkscape Version: 1.0beta2
• Operating System: Windows 10 64-bit