### 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

‮
ERR_FAIL_COND_V(!Variant::has_utility_function(p_function), MethodInfo());
	MethodInfo info(p_function);
	if (Variant::has_utility_function_return_value(p_function)) {
		info.return_val.type = Variant::get_utility_function_return_type(p_function);
		if (info.return_val.type == Variant::NIL) {
			info.return_val.usage |= PROPERTY_USAGE_NIL_IS_VARIANT;
		}
	}
	if (Variant::is_utility_function_vararg(p_function)) {
		info.flags |= METHOD_FLAG_VARARG;
	} else {
		for (int i = 0; i < Variant::get_utility_function_argument_count(p_function); i++) {
			PropertyInfo pi;
#ifdef DEBUG_METHODS_ENABLED
			pi.name = Variant::get_utility_function_argument_name(p_function, i);
#else
			pi.name = "arg" + itos(i + 1);
#endif
			pi.type = Variant::get_utility_function_argument_type(p_function, i);
			info.arguments.push_back(pi);
		}
	}
	return info;
}
static GDScriptParser::DataType make_callable_type(const MethodInfo &p_info) {