### 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

‮
MethodInfo function_info = info_from_utility_func(function_name);
			if (!p_is_root && !p_is_await && function_info.return_val.type == Variant::NIL && ((function_info.return_val.usage & PROPERTY_USAGE_NIL_IS_VARIANT) == 0)) {
				push_error(vformat(R"*(Cannot get return value of call to "%s()" because it returns "void".)*", function_name), p_call);
			}
			if (all_is_constant && Variant::get_utility_function_type(function_name) == Variant::UTILITY_FUNC_TYPE_MATH) {
				
				Vector<const Variant *> args;
				for (int i = 0; i < p_call->arguments.size(); i++) {
					args.push_back(&(p_call->arguments[i]->reduced_value));
				}
				Variant value;
				Callable::CallError err;
				Variant::call_utility_function(function_name, &value, (const Variant **)args.ptr(), args.size(), err);
				switch (err.error) {
					case Callable::CallError::CALL_ERROR_INVALID_ARGUMENT: {
						String expected_type_name;
						if (err.argument < function_info.arguments.size()) {
							expected_type_name = type_from_property(function_info.arguments[err.argument], true).to_string();
						} else {
							expected_type_name = Variant::get_type_name((Variant::Type)err.expected);
						}
						push_error(vformat(R"*(Invalid argument for "%s()" function: argument %d should be "%s" but is "%s".)*", function_name, err.argument + 1,
										   expected_type_name, p_call->arguments[err.argument]->get_datatype().to_string()),
								p_call->arguments[err.argument]);