### 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

‮
GDScriptParser::DataType type;
	type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
	type.kind = GDScriptParser::DataType::NATIVE;
	type.builtin_type = Variant::OBJECT;
	type.native_type = p_class_name;
	type.is_constant = true;
	type.is_meta_type = true;
	return type;
}
static GDScriptParser::DataType make_script_meta_type(const Ref<Script> &p_script) {
	GDScriptParser::DataType type;
	type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
	type.kind = GDScriptParser::DataType::SCRIPT;
	type.builtin_type = Variant::OBJECT;
	type.native_type = p_script->get_instance_base_type();
	type.script_type = p_script;
	type.script_path = p_script->get_path();
	type.is_constant = true;
	type.is_meta_type = true;
	return type;
}
static GDScriptParser::DataType make_enum_type(const StringName &p_enum_name, const String &p_base_name, const bool p_meta = false) {