### 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
}
					GDScriptParser::CompletionContext c = p_context;
					c.current_line = subscript->start_line;
					GDScriptCompletionIdentifier base;
					if (!_guess_expression_type(c, subscript->base, base)) {
						found = false;
						break;
					}
					GDScriptCompletionIdentifier index;
					if (!_guess_expression_type(c, subscript->index, index)) {
						found = false;
						break;
					}
					if (base.value.in(index.value)) {
						Variant value = base.value.get(index.value);
						r_type = _type_from_variant(value);
						found = true;
						break;
					}
					
					const GDScriptParser::DictionaryNode *dn = nullptr;
					if (subscript->base->type == GDScriptParser::Node::DICTIONARY) {
						dn = static_cast<const GDScriptParser::DictionaryNode *>(subscript->base);
					} else if (base.assigned_expression && base.assigned_expression->type == GDScriptParser::Node::DICTIONARY) {
						dn = static_cast<const GDScriptParser::DictionaryNode *>(base.assigned_expression);
					}
					if (dn) {
						for (int i = 0; i < dn->elements.size(); i++) {
							GDScriptCompletionIdentifier key;
							if (!_guess_expression_type(c, dn->elements[i].key, key)) {