### 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)

editor->set_placeholder(p_hint_text);
				}
				editor->set_string_name(true);
				return editor;
			}
		} break;
		case Variant::NODE_PATH: {
			EditorPropertyNodePath *editor = memnew(EditorPropertyNodePath);
			if (p_hint == PROPERTY_HINT_NODE_PATH_TO_EDITED_NODE && !p_hint_text.is_empty()) {
				editor->setup(p_hint_text, Vector<StringName>(), (p_usage & PROPERTY_USAGE_NODE_PATH_FROM_SCENE_ROOT));
			}
			if (p_hint == PROPERTY_HINT_NODE_PATH_VALID_TYPES && !p_hint_text.is_empty()) {
				Vector<String> types = p_hint_text.split(",", false);
				Vector<StringName> sn = Variant(types); 
				editor->setup(NodePath(), sn, (p_usage & PROPERTY_USAGE_NODE_PATH_FROM_SCENE_ROOT));
			}
			return editor;
		} break;
		case Variant::RID: {
			EditorPropertyRID *editor = memnew(EditorPropertyRID);
			return editor;
		} break;
		case Variant::OBJECT: {
			if (p_hint == PROPERTY_HINT_NODE_TYPE) {
				EditorPropertyNodePath *editor = memnew(EditorPropertyNodePath);
				Vector<String> types = p_hint_text.split(",", false);
				Vector<StringName> sn = Variant(types); 
				editor->setup(NodePath(), sn, false, true);
				return editor;
			} else {