### 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)

value = Array(set_array, get_array.get_typed_builtin(), get_array.get_typed_class_name(), get_array.get_typed_script());
								}
							}
						}
						if (p_edit_state == GEN_EDIT_STATE_INSTANCE && value.get_type() != Variant::OBJECT) {
							value = value.duplicate(true); 
						}
						bool set_valid = true;
						if (ResourceLoader::is_creating_missing_resources_if_class_unavailable_enabled() && value.get_type() == Variant::OBJECT) {
							Ref<MissingResource> mr = value;
							if (mr.is_valid()) {
								missing_resource_properties[snames[nprops[j].name]] = mr;
								set_valid = false;
							}
						}
						if (set_valid) {
							node->set(snames[nprops[j].name], value, &valid);
						}
					}
				}
				if (!missing_resource_properties.is_empty()) {
					node->set_meta(META_MISSING_RESOURCES, missing_resource_properties);
				}
			}
			
			
			for (int j = 0; j < n.groups.size(); j++) {
				ERR_FAIL_INDEX_V(n.groups[j], sname_count, nullptr);
				node->add_to_group(snames[n.groups[j]], true);
			}