### 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("Enum ");
	if (p_enum->identifier != nullptr) {
		print_identifier(p_enum->identifier);
	} else {
		push_text("<unnamed>");
	}
	push_line(" {");
	increase_indent();
	for (int i = 0; i < p_enum->values.size(); i++) {
		const EnumNode::Value &item = p_enum->values[i];
		print_identifier(item.identifier);
		push_text(" = ");
		push_text(itos(item.value));
		push_line(" ,");
	}
	decrease_indent();
	push_line("}");
}
void GDScriptParser::TreePrinter::print_for(ForNode *p_for) {
	push_text("For ");
	print_identifier(p_for->variable);
	push_text(" IN ");
	print_expression(p_for->list);
	push_line(" :");
	increase_indent();
	print_suite(p_for->loop);
	decrease_indent();
}
void GDScriptParser::TreePrinter::print_function(FunctionNode *p_function, const String &p_context) {