### 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::ENUM;
	type.builtin_type = p_meta ? Variant::DICTIONARY : Variant::INT;
	type.enum_type = p_enum_name;
	type.is_constant = true;
	type.is_meta_type = p_meta;
	
	
	type.native_type = p_base_name + ENUM_SEPARATOR + p_enum_name;
	return type;
}
static GDScriptParser::DataType make_native_enum_type(const StringName &p_enum_name, const StringName &p_native_class, const bool p_meta = true) {
	GDScriptParser::DataType type = make_enum_type(p_enum_name, p_native_class, p_meta);
	List<StringName> enum_values;
	ClassDB::get_enum_constants(p_native_class, p_enum_name, &enum_values);
	for (const StringName &E : enum_values) {
		type.enum_values[E] = ClassDB::get_integer_constant(p_native_class, E);
	}
	return type;
}
static GDScriptParser::DataType make_builtin_meta_type(Variant::Type p_type) {