Summary
When you select a node from palette, the component you are clicking at is ignored if it is located above canvas.
If you select a node from palette and click on palette again the selection is added under the palette into canvas.
If you select a node from palette and click on Properties the selection is added under the properties into canvas.
If you select a node from palette and click on Diagram Explorer the node is added into canvas under the explorer.
If you select a node from palette and click on Zoom, the selection is added into canvas under zoom component.
All of the above are issues, it does not make sense to add the selection to canvas when I am clicking on Properties or Palette or Diagram explorer or any other component above canvas.
For example:
If you select a node from palette and click on another Node in canvas an error is thrown. Depends on the node we are clicking on, this is expected as not all node can contains others. Same behaviors should happen for properties palette etc.

Actual results
Selection is added to canvas.

Expected results
Selection is removed or kept and it is only added to canvas when user click on canvas directly.