### 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

‮
}
					}
					break;
				case DictionaryNode::PYTHON_DICT:
					if (!match(GDScriptTokenizer::Token::COLON)) {
						if (match(GDScriptTokenizer::Token::EQUAL)) {
							push_error(R"(Expected ":" after dictionary key. Mixing dictionary styles is not allowed.)");
							advance(); 
						} else {
							push_error(R"(Expected ":" after dictionary key.)");
						}
					}
					break;
			}
			
			ExpressionNode *value = parse_expression(false);
			if (value == nullptr) {
				push_error(R"(Expected expression as dictionary value.)");
			}
			if (key != nullptr && value != nullptr) {
				dictionary->elements.push_back({ key, value });
			}
		} while (match(GDScriptTokenizer::Token::COMMA) && !is_at_end());
	}
	pop_multiline();
	consume(GDScriptTokenizer::Token::BRACE_CLOSE, R"(Expected closing "}" after dictionary elements.)");
	complete_extents(dictionary);
	return dictionary;
}
GDScriptParser::ExpressionNode *GDScriptParser::parse_grouping(ExpressionNode *p_previous_operand, bool p_can_assign) {