### 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)

NodePath p;
	if (pointer_mode) {
		p = get_edited_object()->get(_get_meta_pointer_property());
	} else {
		p = get_edited_property_value();
	}
	assign->set_tooltip_text(p);
	if (p == NodePath()) {
		assign->set_icon(Ref<Texture2D>());
		assign->set_text(TTR("Assign..."));
		assign->set_flat(false);
		return;
	}
	assign->set_flat(true);
	Node *base_node = nullptr;
	if (base_hint != NodePath()) {
		if (get_tree()->get_root()->has_node(base_hint)) {
			base_node = get_tree()->get_root()->get_node(base_hint);
		}
	} else {
		base_node = Object::cast_to<Node>(get_edited_object());
	}
	if (!base_node || !base_node->has_node(p)) {