### 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

‮
if (builtin_types.is_empty()) {
		builtin_types["bool"] = Variant::BOOL;
		builtin_types["int"] = Variant::INT;
		builtin_types["float"] = Variant::FLOAT;
		builtin_types["String"] = Variant::STRING;
		builtin_types["Vector2"] = Variant::VECTOR2;
		builtin_types["Vector2i"] = Variant::VECTOR2I;
		builtin_types["Rect2"] = Variant::RECT2;
		builtin_types["Rect2i"] = Variant::RECT2I;
		builtin_types["Transform2D"] = Variant::TRANSFORM2D;
		builtin_types["Vector3"] = Variant::VECTOR3;
		builtin_types["Vector3i"] = Variant::VECTOR3I;
		builtin_types["Vector4"] = Variant::VECTOR4;
		builtin_types["Vector4i"] = Variant::VECTOR4I;
		builtin_types["AABB"] = Variant::AABB;
		builtin_types["Plane"] = Variant::PLANE;
		builtin_types["Quaternion"] = Variant::QUATERNION;
		builtin_types["Basis"] = Variant::BASIS;
		builtin_types["Transform3D"] = Variant::TRANSFORM3D;
		builtin_types["Projection"] = Variant::PROJECTION;
		builtin_types["Color"] = Variant::COLOR;
		builtin_types["RID"] = Variant::RID;
		builtin_types["Object"] = Variant::OBJECT;
		builtin_types["StringName"] = Variant::STRING_NAME;
		builtin_types["NodePath"] = Variant::NODE_PATH;
		builtin_types["Dictionary"] = Variant::DICTIONARY;
		builtin_types["Callable"] = Variant::CALLABLE;