### 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

‮
switch (type) {
		case SuiteNode::Local::PARAMETER:
			return "parameter";
		case SuiteNode::Local::CONSTANT:
			return "constant";
		case SuiteNode::Local::VARIABLE:
			return "variable";
		case SuiteNode::Local::FOR_VARIABLE:
			return "for loop iterator";
		case SuiteNode::Local::PATTERN_BIND:
			return "pattern_bind";
		case SuiteNode::Local::UNDEFINED:
			return "<undefined>";
		default:
			return String();
	}
}
String GDScriptParser::DataType::to_string() const {