### Godot version

v4.0.beta.custom_build [eaf306e0b]

### System information

Windows 10

### Issue description

Selecting a `Window` node in the Editor's SceneTree results in the message
```
editor/editor_data.cpp:1058 - Parameter "p_node" is null.
```
and the Inspector shows empty content instead of the Window's properties.

I would expect, that clicking on a node in the SceneTree lets me edit the properties of the node.

Bisecting shows that this behavior got introduced in #71770

### Steps to reproduce

1. Create a Window node
2. Click on the Window node in the Editor's SceneTree

### Minimal reproduction project

N/A
Ref<InputEventMouseMotion> m = p_event;
	Ref<InputEventMouseButton> b = p_event;
	Ref<InputEventKey> k = p_event;
	
	if (drag_type == DRAG_NONE) {
		if ((b.is_valid() && b->is_pressed() && b->get_button_index() == MouseButton::LEFT && tool == TOOL_EDIT_PIVOT) ||
				(k.is_valid() && k->is_pressed() && !k->is_echo() && k->get_keycode() == Key::V && tool == TOOL_SELECT && k->get_modifiers_mask().is_empty())) {
			List<CanvasItem *> selection = _get_edited_canvas_items();
			
			drag_selection = List<CanvasItem *>();
			for (CanvasItem *ci : selection) {
				if (ci->_edit_use_pivot()) {
					drag_selection.push_back(ci);
				}
			}
			
			if (drag_selection.size() > 0) {
				_save_canvas_item_state(drag_selection);
				drag_from = transform.affine_inverse().xform((b.is_valid()) ? b->get_position() : viewport->get_local_mouse_position());
				Vector2 new_pos;
				if (drag_selection.size() == 1) {
					new_pos = snap_point(drag_from, SNAP_NODE_SIDES | SNAP_NODE_CENTER | SNAP_NODE_ANCHORS | SNAP_OTHER_NODES | SNAP_GRID | SNAP_PIXEL, 0, drag_selection[0]);
				} else {
					new_pos = snap_point(drag_from, SNAP_OTHER_NODES | SNAP_GRID | SNAP_PIXEL, 0, nullptr, drag_selection);
				}
				for (CanvasItem *ci : drag_selection) {
					ci->_edit_set_pivot(ci->get_global_transform_with_canvas().affine_inverse().xform(new_pos));
				}