### Godot version

3b086aa06

### System information

ArchLinux x11

### Issue description

```gdscript
extends Node

@export_group("My Properties")
@export var number = 3
@export var string = ""

@export_group("Prefixed Properties", "prefix_")
@export var prefix_number = 3
@export var prefix_string = ""

@export_group("", "")
@export var ungrouped_number = 3
```

![image](https://user-images.githubusercontent.com/70787919/214983963-528c415b-745b-47fc-9777-36ebe31a3060.png)


### Steps to reproduce

- create script
- @export_group
- go inspector

### Minimal reproduction project

‮
String path = ScriptServer::get_global_class_path(first);
			String ext = path.get_extension();
			if (ext == GDScriptLanguage::get_singleton()->get_extension()) {
				Ref<GDScriptParserRef> ref = get_parser_for(path);
				if (!ref.is_valid() || ref->raise_status(GDScriptParserRef::INHERITANCE_SOLVED) != OK) {
					push_error(vformat(R"(Could not parse global class "%s" from "%s".)", first, ScriptServer::get_global_class_path(first)), p_type);
					return bad_type;
				}
				result = ref->get_parser()->head->get_datatype();
			} else {
				result = make_script_meta_type(ResourceLoader::load(path, "Script"));
			}
		}
	} else if (ProjectSettings::get_singleton()->has_autoload(first) && ProjectSettings::get_singleton()->get_autoload(first).is_singleton) {
		const ProjectSettings::AutoloadInfo &autoload = ProjectSettings::get_singleton()->get_autoload(first);
		Ref<GDScriptParserRef> ref = get_parser_for(autoload.path);
		if (ref->raise_status(GDScriptParserRef::INHERITANCE_SOLVED) != OK) {
			push_error(vformat(R"(Could not parse singleton "%s" from "%s".)", first, autoload.path), p_type);
			return bad_type;
		}
		result = ref->get_parser()->head->get_datatype();
	} else if (ClassDB::has_enum(parser->current_class->base_type.native_type, first)) {
		
		result = make_native_enum_type(first, parser->current_class->base_type.native_type);
	} else {
		
		List<GDScriptParser::ClassNode *> script_classes;
		bool found = false;
		get_class_node_current_scope_classes(parser->current_class, &script_classes);
		for (GDScriptParser::ClassNode *script_class : script_classes) {