### 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

‮
void GDScriptParser::TreePrinter::print_expression(ExpressionNode *p_expression) {
	if (p_expression == nullptr) {
		push_text("<invalid expression>");
		return;
	}
	switch (p_expression->type) {
		case Node::ARRAY:
			print_array(static_cast<ArrayNode *>(p_expression));
			break;
		case Node::ASSIGNMENT:
			print_assignment(static_cast<AssignmentNode *>(p_expression));
			break;
		case Node::AWAIT:
			print_await(static_cast<AwaitNode *>(p_expression));
			break;
		case Node::BINARY_OPERATOR:
			print_binary_op(static_cast<BinaryOpNode *>(p_expression));
			break;
		case Node::CALL:
			print_call(static_cast<CallNode *>(p_expression));
			break;
		case Node::CAST:
			print_cast(static_cast<CastNode *>(p_expression));
			break;
		case Node::DICTIONARY:
			print_dictionary(static_cast<DictionaryNode *>(p_expression));
			break;
		case Node::GET_NODE:
			print_get_node(static_cast<GetNodeNode *>(p_expression));
			break;