### Godot version

4.0-rc6

### System information

Fedora 37, Mesa Intel ADL GT2

### Issue description

Code that works as expected at runtime fails with Nil references to (assigned) exported vars in the editor:

![tool_global_position_error](https://user-images.githubusercontent.com/364501/222031460-ffb1ecbd-5175-4a42-8470-25285ba5f821.png)


### Steps to reproduce

Try to access the `global_position` of a `Node3D` that's assigned to an exported var.

See that it works at runtime.

See that it errors in the editor with:

> Invalid get index 'global_position' (on base: 'Nil').

### Minimal reproduction project

[tool_test.zip](https://github.com/godotengine/godot/files/10856640/tool_test.zip)

}
	
	
	List<Node::GroupInfo> groups;
	p_node->get_groups(&groups);
	for (const Node::GroupInfo &gi : groups) {
		if (!gi.persistent) {
			continue;
		}
		bool skip = false;
		for (const SceneState::PackState &ia : states_stack) {
			
			if (ia.state->is_node_in_group(ia.node, gi.name)) {
				skip = true;
				break;
			}
		}
		if (skip) {
			continue;
		}
		nd.groups.push_back(_nm_get_string(gi.name, name_map));
	}
	
	
	
	
	if (p_node == p_owner) {
		
		nd.owner = -1;
	} else if (p_node->get_owner() == p_owner) {