### 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

‮
AssertNode *assert = alloc_node<AssertNode>();
	push_multiline(true);
	consume(GDScriptTokenizer::Token::PARENTHESIS_OPEN, R"(Expected "(" after "assert".)");
	assert->condition = parse_expression(false);
	if (assert->condition == nullptr) {
		push_error("Expected expression to assert.");
		pop_multiline();
		complete_extents(assert);
		return nullptr;
	}
	if (match(GDScriptTokenizer::Token::COMMA) && !check(GDScriptTokenizer::Token::PARENTHESIS_CLOSE)) {
		assert->message = parse_expression(false);
		if (assert->message == nullptr) {
			push_error(R"(Expected error message for assert after ",".)");
			pop_multiline();
			complete_extents(assert);
			return nullptr;
		}
		match(GDScriptTokenizer::Token::COMMA);
	}
	pop_multiline();
	consume(GDScriptTokenizer::Token::PARENTHESIS_CLOSE, R"*(Expected ")" after assert expression.)*");
	complete_extents(assert);
	end_statement(R"("assert")");
	return assert;
}
GDScriptParser::BreakNode *GDScriptParser::parse_break() {