### 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

‮
print_identifier(p_parameter->identifier);
	if (p_parameter->datatype_specifier != nullptr) {
		push_text(" : ");
		print_type(p_parameter->datatype_specifier);
	}
	if (p_parameter->initializer != nullptr) {
		push_text(" = ");
		print_expression(p_parameter->initializer);
	}
}
void GDScriptParser::TreePrinter::print_preload(PreloadNode *p_preload) {
	push_text(R"(Preload ( ")");
	push_text(p_preload->resolved_path);
	push_text(R"(" )");
}
void GDScriptParser::TreePrinter::print_return(ReturnNode *p_return) {
	push_text("Return");
	if (p_return->return_value != nullptr) {
		push_text(" ");
		print_expression(p_return->return_value);
	}
	push_line();
}
void GDScriptParser::TreePrinter::print_self(SelfNode *p_self) {