### 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

‮
GDScriptTokenizer::Token::Type invalid = previous.type;
	switch (invalid) {
		case GDScriptTokenizer::Token::QUESTION_MARK:
			push_error(R"(Unexpected "?" in source. If you want a ternary operator, use "truthy_value if true_condition else falsy_value".)");
			break;
		default:
			return nullptr; 
	}
	
	return p_previous_operand;
}
GDScriptParser::TypeNode *GDScriptParser::parse_type(bool p_allow_void) {
	TypeNode *type = alloc_node<TypeNode>();
	make_completion_context(p_allow_void ? COMPLETION_TYPE_NAME_OR_VOID : COMPLETION_TYPE_NAME, type);
	if (!match(GDScriptTokenizer::Token::IDENTIFIER)) {
		if (match(GDScriptTokenizer::Token::VOID)) {
			if (p_allow_void) {
				complete_extents(type);
				TypeNode *void_type = type;
				return void_type;
			} else {
				push_error(R"("void" is only allowed for a function return type.)");
			}
		}
		
		complete_extents(type);
		return nullptr;
	}
	IdentifierNode *type_element = parse_identifier();