### 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

‮
base = base_parser->get_parser()->head->get_datatype();
				}
			} else if (ProjectSettings::get_singleton()->has_autoload(name) && ProjectSettings::get_singleton()->get_autoload(name).is_singleton) {
				const ProjectSettings::AutoloadInfo &info = ProjectSettings::get_singleton()->get_autoload(name);
				if (info.path.get_extension().to_lower() != GDScriptLanguage::get_singleton()->get_extension()) {
					push_error(vformat(R"(Singleton %s is not a GDScript.)", info.name), p_class);
					return ERR_PARSE_ERROR;
				}
				Ref<GDScriptParserRef> info_parser = get_parser_for(info.path);
				if (info_parser.is_null()) {
					push_error(vformat(R"(Could not parse singleton from "%s".)", info.path), p_class);
					return ERR_PARSE_ERROR;
				}
				Error err = info_parser->raise_status(GDScriptParserRef::INHERITANCE_SOLVED);
				if (err != OK) {
					push_error(vformat(R"(Could not resolve super class inheritance from "%s".)", name), p_class);
					return err;
				}
				base = info_parser->get_parser()->head->get_datatype();
			} else if (class_exists(name)) {
				base.kind = GDScriptParser::DataType::NATIVE;
				base.native_type = name;
			} else {
				
				bool found = false;
				List<GDScriptParser::ClassNode *> script_classes;
				get_class_node_current_scope_classes(p_class, &script_classes);
				for (GDScriptParser::ClassNode *look_class : script_classes) {
					if (look_class->identifier && look_class->identifier->name == name) {
						if (!look_class->get_datatype().is_set()) {