Cannot Undo Blueprint Nodes Placed Using Shortcuts

Nodes that are placed using shortcuts (ex. B+LMB for a branch node) cannot be undone using CTRL+Z.

Found in 4.10.4 binary. Reproduced in 4.11 Preview 6 binary and Main CL 2894512.

1. Open the editor
2. Create a new actor blueprint
3. Use B+LMB to place a branch node
4. CTRL+Z to undo

Result: Node is not removed from the graph

Expected: Node would be removed when you used the undo feature.