### 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

‮
const GDScriptParser::DataType *current_data_type = &p_class_node->base_type;
	while (current_data_type && current_data_type->kind == GDScriptParser::DataType::Kind::CLASS) {
		GDScriptParser::ClassNode *current_class_node = current_data_type->class_type;
		if (has_member_name_conflict_in_script_class(p_member_name, current_class_node, p_member_node)) {
			String parent_class_name = current_class_node->fqcn;
			if (current_class_node->identifier != nullptr) {
				parent_class_name = current_class_node->identifier->name;
			}
			push_error(vformat(R"(The member "%s" already exists in parent class %s.)", p_member_name, parent_class_name), p_member_node);
			return ERR_PARSE_ERROR;
		}
		current_data_type = &current_class_node->base_type;
	}
	
	if (current_data_type && current_data_type->kind == GDScriptParser::DataType::Kind::NATIVE) {
		if (current_data_type->native_type != StringName()) {
			return check_native_member_name_conflict(
					p_member_name,
					p_member_node,
					current_data_type->native_type);
		}
	}
	return OK;
}
void GDScriptAnalyzer::get_class_node_current_scope_classes(GDScriptParser::ClassNode *p_node, List<GDScriptParser::ClassNode *> *p_list) {