### 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

‮
StringName elem_type_name = p_property.hint_string;
			GDScriptParser::DataType elem_type;
			elem_type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
			Variant::Type elem_builtin_type = GDScriptParser::get_builtin_type(elem_type_name);
			if (elem_builtin_type < Variant::VARIANT_MAX) {
				
				elem_type.kind = GDScriptParser::DataType::BUILTIN;
				elem_type.builtin_type = elem_builtin_type;
			} else if (class_exists(elem_type_name)) {
				elem_type.kind = GDScriptParser::DataType::NATIVE;
				elem_type.builtin_type = Variant::OBJECT;
				elem_type.native_type = p_property.hint_string;
			} else if (ScriptServer::is_global_class(elem_type_name)) {
				
				Ref<Script> script = ResourceLoader::load(ScriptServer::get_global_class_path(elem_type_name));
				elem_type.kind = GDScriptParser::DataType::SCRIPT;
				elem_type.builtin_type = Variant::OBJECT;
				elem_type.native_type = script->get_instance_base_type();
				elem_type.script_type = script;
			} else {
				ERR_FAIL_V_MSG(result, "Could not find element type from property hint of a typed array.");
			}
			elem_type.is_constant = false;
			result.set_container_element_type(elem_type);
		}
	}
	return result;
}
bool GDScriptAnalyzer::get_function_signature(GDScriptParser::Node *p_source, bool p_is_constructor, GDScriptParser::DataType p_base_type, const StringName &p_function, GDScriptParser::DataType &r_return_type, List<GDScriptParser::DataType> &r_par_types, int &r_default_arg_count, bool &r_static, bool &r_vararg) {