### 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
edited_item_type = p_item_type;
	edit_items_tree->clear();
	TreeItem *root = edit_items_tree->create_item();
	List<StringName> names;
	bool has_any_items = false;
	{ 
		names.clear();
		edited_theme->get_color_list(p_item_type, &names);
		if (names.size() > 0) {
			TreeItem *color_root = edit_items_tree->create_item(root);
			color_root->set_metadata(0, Theme::DATA_TYPE_COLOR);
			color_root->set_icon(0, get_theme_icon(SNAME("Color"), SNAME("EditorIcons")));
			color_root->set_text(0, TTR("Colors"));
			color_root->add_button(0, get_theme_icon(SNAME("Clear"), SNAME("EditorIcons")), ITEMS_TREE_REMOVE_DATA_TYPE, false, TTR("Remove All Color Items"));
			names.sort_custom<StringName::AlphCompare>();
			for (const StringName &E : names) {
				TreeItem *item = edit_items_tree->create_item(color_root);
				item->set_text(0, E);
				item->add_button(0, get_theme_icon(SNAME("Edit"), SNAME("EditorIcons")), ITEMS_TREE_RENAME_ITEM, false, TTR("Rename Item"));
				item->add_button(0, get_theme_icon(SNAME("Remove"), SNAME("EditorIcons")), ITEMS_TREE_REMOVE_ITEM, false, TTR("Remove Item"));
			}
			has_any_items = true;
		}
	}
	{