### 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

‮
UnaryOpNode *operation = alloc_node<UnaryOpNode>();
	reset_extents(operation, p_previous_operand);
	update_extents(operation);
	consume(GDScriptTokenizer::Token::IN, R"(Expected "in" after "not" in content-test operator.)");
	ExpressionNode *in_operation = parse_binary_operator(p_previous_operand, p_can_assign);
	operation->operation = UnaryOpNode::OP_LOGIC_NOT;
	operation->variant_op = Variant::OP_NOT;
	operation->operand = in_operation;
	complete_extents(operation);
	return operation;
}
GDScriptParser::ExpressionNode *GDScriptParser::parse_binary_operator(ExpressionNode *p_previous_operand, bool p_can_assign) {
	GDScriptTokenizer::Token op = previous;
	BinaryOpNode *operation = alloc_node<BinaryOpNode>();
	reset_extents(operation, p_previous_operand);
	update_extents(operation);
	Precedence precedence = (Precedence)(get_rule(op.type)->precedence + 1);
	operation->left_operand = p_previous_operand;
	operation->right_operand = parse_precedence(precedence, false);
	complete_extents(operation);
	if (operation->right_operand == nullptr) {
		push_error(vformat(R"(Expected expression after "%s" operator.")", op.get_name()));
	}
	
	switch (op.type) {
		case GDScriptTokenizer::Token::PLUS: