### Godot version

4.2 f5696c3

### System information

Windows 10 x64

### Issue description

![image](https://github.com/godotengine/godot/assets/2223172/7ad0e3b6-9599-4f7b-a07c-da54779e647a)


### Steps to reproduce

1. Add node
2. Attach a built-in script
3. Add child node
4. Add script to the child node
5. In some method write `get_parent().bui`

### Minimal reproduction project

N/A
continue;
							}
							if (key.value == index.value) {
								r_type.assigned_expression = dn->elements[i].value;
								found = _guess_expression_type(p_context, dn->elements[i].value, r_type);
								break;
							}
						}
					}
					
					if (!found && index.value.is_num()) {
						int idx = index.value;
						const GDScriptParser::ArrayNode *an = nullptr;
						if (subscript->base->type == GDScriptParser::Node::ARRAY) {
							an = static_cast<const GDScriptParser::ArrayNode *>(subscript->base);
						} else if (base.assigned_expression && base.assigned_expression->type == GDScriptParser::Node::ARRAY) {
							an = static_cast<const GDScriptParser::ArrayNode *>(base.assigned_expression);
						}
						if (an && idx >= 0 && an->elements.size() > idx) {
							r_type.assigned_expression = an->elements[idx];
							found = _guess_expression_type(c, an->elements[idx], r_type);
							break;
						}
					}
					
					if (!found && (index.value.get_type() == Variant::STRING || index.value.get_type() == Variant::NODE_PATH)) {
						StringName id = index.value;
						found = _guess_identifier_type_from_base(c, base, id, r_type);
					} else if (!found && index.type.kind == GDScriptParser::DataType::BUILTIN) {
						Callable::CallError err;