### 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

‮
SubscriptNode *subscript = alloc_node<SubscriptNode>();
	reset_extents(subscript, p_previous_operand);
	update_extents(subscript);
	make_completion_context(COMPLETION_SUBSCRIPT, subscript);
	subscript->base = p_previous_operand;
	subscript->index = parse_expression(false);
	if (subscript->index == nullptr) {
		push_error(R"(Expected expression after "[".)");
	}
	pop_multiline();
	consume(GDScriptTokenizer::Token::BRACKET_CLOSE, R"(Expected "]" after subscription index.)");
	complete_extents(subscript);
	return subscript;
}
GDScriptParser::ExpressionNode *GDScriptParser::parse_cast(ExpressionNode *p_previous_operand, bool p_can_assign) {
	CastNode *cast = alloc_node<CastNode>();
	reset_extents(cast, p_previous_operand);
	update_extents(cast);
	cast->operand = p_previous_operand;
	cast->cast_type = parse_type();
	complete_extents(cast);
	if (cast->cast_type == nullptr) {
		push_error(R"(Expected type specifier after "as".)");
		return p_previous_operand;
	}
	return cast;
}
GDScriptParser::ExpressionNode *GDScriptParser::parse_call(ExpressionNode *p_previous_operand, bool p_can_assign) {