### 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

‮
FunctionNode *function = alloc_node<FunctionNode>();
	bool _static = false;
	if (previous.type == GDScriptTokenizer::Token::STATIC) {
		
		if (!consume(GDScriptTokenizer::Token::FUNC, R"(Expected "func" after "static".)")) {
			complete_extents(function);
			return nullptr;
		}
		_static = true;
	}
	make_completion_context(COMPLETION_OVERRIDE_METHOD, function);
	if (!consume(GDScriptTokenizer::Token::IDENTIFIER, R"(Expected function name after "func".)")) {
		complete_extents(function);
		return nullptr;
	}
	FunctionNode *previous_function = current_function;
	current_function = function;
	function->identifier = parse_identifier();
	function->is_static = _static;
	SuiteNode *body = alloc_node<SuiteNode>();
	SuiteNode *previous_suite = current_suite;
	current_suite = body;
	push_multiline(true);
	consume(GDScriptTokenizer::Token::PARENTHESIS_OPEN, R"(Expected opening "(" after function name.)");
	parse_function_signature(function, body, "function");