### Godot version

4.1.1

### System information

windows 11

### Issue description

When registering a type with class_name and using that class name to declare a variable in code only, autocomplete works as expected anywhere in other nodes/scenes. However, if making a custom scene node that extends a script with the class_name, if that custom scene is instantiated in a different scene, even if the type is specified, it only shows the parent node's functions and not any of the extended functionality. I have made a basic project showing the issue

### Steps to reproduce

I have made a very simple project showing the issue. https://github.com/mmmmmmmmmmmmmmmmmmmdonuts/godot_4_autocomplete_issue essentially, the extended Node scene will only show the custom function when both the type is specified as well as the type afterwards following "as" 
e.g. `@onready var my_class_4: MyClass = $MyClass4 as MyClass`

### Minimal reproduction project

https://github.com/mmmmmmmmmmmmmmmmmmmdonuts/godot_4_autocomplete_issue
}
				}
				return false;
			} break;
			default: {
				return false;
			}
		}
	}
	return false;
}
static void _find_enumeration_candidates(GDScriptParser::CompletionContext &p_context, const String &p_enum_hint, HashMap<String, ScriptLanguage::CodeCompletionOption> &r_result) {
	if (!p_enum_hint.contains(".")) {
		
		StringName current_enum = p_enum_hint;
		if (p_context.current_class && p_context.current_class->has_member(current_enum) && p_context.current_class->get_member(current_enum).type == GDScriptParser::ClassNode::Member::ENUM) {
			const GDScriptParser::EnumNode *_enum = p_context.current_class->get_member(current_enum).m_enum;
			for (int i = 0; i < _enum->values.size(); i++) {
				ScriptLanguage::CodeCompletionOption option(_enum->values[i].identifier->name, ScriptLanguage::CODE_COMPLETION_KIND_ENUM);
				r_result.insert(option.display, option);
			}
		} else {
			for (int i = 0; i < CoreConstants::get_global_constant_count(); i++) {
				if (CoreConstants::get_global_constant_enum(i) == current_enum) {
					ScriptLanguage::CodeCompletionOption option(CoreConstants::get_global_constant_name(i), ScriptLanguage::CODE_COMPLETION_KIND_ENUM);
					r_result.insert(option.display, option);
				}
			}
		}
	} else {