### 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

‮
push_text("Self(");
	if (p_self->current_class->identifier != nullptr) {
		print_identifier(p_self->current_class->identifier);
	} else {
		push_text("<main class>");
	}
	push_text(")");
}
void GDScriptParser::TreePrinter::print_signal(SignalNode *p_signal) {
	push_text("Signal ");
	print_identifier(p_signal->identifier);
	push_text("( ");
	for (int i = 0; i < p_signal->parameters.size(); i++) {
		print_parameter(p_signal->parameters[i]);
	}
	push_line(" )");
}
void GDScriptParser::TreePrinter::print_subscript(SubscriptNode *p_subscript) {
	print_expression(p_subscript->base);
	if (p_subscript->is_attribute) {
		push_text(".");
		print_identifier(p_subscript->attribute);
	} else {
		push_text("[ ");
		print_expression(p_subscript->index);
		push_text(" ]");
	}
}
void GDScriptParser::TreePrinter::print_statement(Node *p_statement) {