### 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

‮
reduce_expression(p_binary_op->left_operand);
	if (p_binary_op->operation == GDScriptParser::BinaryOpNode::OP_TYPE_TEST && p_binary_op->right_operand && p_binary_op->right_operand->type == GDScriptParser::Node::IDENTIFIER) {
		reduce_identifier(static_cast<GDScriptParser::IdentifierNode *>(p_binary_op->right_operand), true);
	} else {
		reduce_expression(p_binary_op->right_operand);
	}
	
	GDScriptParser::DataType left_type;
	if (p_binary_op->left_operand) {
		left_type = p_binary_op->left_operand->get_datatype();
	}
	GDScriptParser::DataType right_type;
	if (p_binary_op->right_operand) {
		right_type = p_binary_op->right_operand->get_datatype();
	}
	if (!left_type.is_set() || !right_type.is_set()) {
		return;