### 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

‮
GDScriptParser::DataType result = p_meta_type;
	result.is_meta_type = false;
	if (p_meta_type.kind == GDScriptParser::DataType::ENUM) {
		result.builtin_type = Variant::INT;
	} else {
		result.is_constant = false;
	}
	return result;
}
GDScriptParser::DataType GDScriptAnalyzer::type_from_property(const PropertyInfo &p_property, bool p_is_arg) const {
	GDScriptParser::DataType result;
	result.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
	if (p_property.type == Variant::NIL && (p_is_arg || (p_property.usage & PROPERTY_USAGE_NIL_IS_VARIANT))) {
		
		result.kind = GDScriptParser::DataType::VARIANT;
		return result;
	}
	result.builtin_type = p_property.type;
	if (p_property.type == Variant::OBJECT) {
		result.kind = GDScriptParser::DataType::NATIVE;
		result.native_type = p_property.class_name == StringName() ? SNAME("Object") : p_property.class_name;
	} else {
		result.kind = GDScriptParser::DataType::BUILTIN;
		result.builtin_type = p_property.type;
		if (p_property.type == Variant::ARRAY && p_property.hint == PROPERTY_HINT_ARRAY_TYPE) {