### 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

‮
native_base = export_type.script_type->get_instance_base_type();
				}
				if (class_name == StringName()) {
					Ref<Script> script = ResourceLoader::load(export_type.script_path, SNAME("Script"));
					if (script.is_valid()) {
						class_name = script->get_language()->get_global_class_name(export_type.script_path);
						native_base = script->get_instance_base_type();
					}
				}
				if (class_name != StringName() && native_base != StringName() && ClassDB::is_parent_class(native_base, SNAME("Resource"))) {
					variable->export_info.type = Variant::OBJECT;
					variable->export_info.hint = PROPERTY_HINT_RESOURCE_TYPE;
					variable->export_info.hint_string = class_name;
				}
			} break;
			case GDScriptParser::DataType::ENUM: {
				variable->export_info.type = Variant::INT;
				variable->export_info.hint = PROPERTY_HINT_ENUM;
				String enum_hint_string;
				bool first = true;
				for (const KeyValue<StringName, int64_t> &E : export_type.enum_values) {
					if (!first) {
						enum_hint_string += ",";
					} else {
						first = false;
					}
					enum_hint_string += E.key.operator String().capitalize().xml_escape();
					enum_hint_string += ":";
					enum_hint_string += String::num_int64(E.value).xml_escape();
				}