### 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
smartsnap_config_popup->set_item_checked(idx, snap_node_sides);
	}
	if (state.has("snap_node_center")) {
		snap_node_center = state["snap_node_center"];
		int idx = smartsnap_config_popup->get_item_index(SNAP_USE_NODE_CENTER);
		smartsnap_config_popup->set_item_checked(idx, snap_node_center);
	}
	if (state.has("snap_other_nodes")) {
		snap_other_nodes = state["snap_other_nodes"];
		int idx = smartsnap_config_popup->get_item_index(SNAP_USE_OTHER_NODES);
		smartsnap_config_popup->set_item_checked(idx, snap_other_nodes);
	}
	if (state.has("snap_guides")) {
		snap_guides = state["snap_guides"];
		int idx = smartsnap_config_popup->get_item_index(SNAP_USE_GUIDES);
		smartsnap_config_popup->set_item_checked(idx, snap_guides);
	}
	if (state.has("grid_visibility")) {
		grid_visibility = (GridVisibility)(int)(state["grid_visibility"]);
	}
	if (state.has("show_origin")) {
		show_origin = state["show_origin"];
		int idx = view_menu->get_popup()->get_item_index(SHOW_ORIGIN);
		view_menu->get_popup()->set_item_checked(idx, show_origin);
	}
	if (state.has("show_viewport")) {
		show_viewport = state["show_viewport"];
		int idx = view_menu->get_popup()->get_item_index(SHOW_VIEWPORT);
		view_menu->get_popup()->set_item_checked(idx, show_viewport);
	}