### 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
if (updating_tree) {
		return;
	}
	updating_tree = true;
	TreeItem *root = import_items_tree->get_root();
	_select_all_subitems(root, false);
	updating_tree = false;
}
void ThemeItemImportTree::_select_full_items_pressed() {
	if (updating_tree) {
		return;
	}
	updating_tree = true;
	TreeItem *root = import_items_tree->get_root();
	_select_all_subitems(root, true);
	updating_tree = false;
}
void ThemeItemImportTree::_deselect_all_items_pressed() {
	if (updating_tree) {
		return;
	}
	updating_tree = true;
	TreeItem *root = import_items_tree->get_root();
	_deselect_all_subitems(root, true);
	updating_tree = false;
}
void ThemeItemImportTree::_select_all_data_type_pressed(int p_data_type) {