### 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

‮
variable->export_info.hint_string = enum_hint_string;
			} break;
			default:
				
				push_error(R"(Export type can only be built-in, a resource, or an enum.)", variable);
				break;
		}
		if (is_array) {
			String hint_prefix = itos(variable->export_info.type);
			if (variable->export_info.hint) {
				hint_prefix += "/" + itos(variable->export_info.hint);
			}
			variable->export_info.hint = PROPERTY_HINT_TYPE_STRING;
			variable->export_info.hint_string = hint_prefix + ":" + variable->export_info.hint_string;
			variable->export_info.type = Variant::ARRAY;
		}
	} else {
		
		if (!export_type.is_variant() && (export_type.kind != DataType::BUILTIN || export_type.builtin_type != t_type)) {
			
			if ((t_type != Variant::FLOAT || export_type.builtin_type != Variant::INT) && (t_type != Variant::INT || export_type.builtin_type != Variant::FLOAT)) {
				push_error(vformat(R"("%s" annotation requires a variable of type "%s" but type "%s" was given instead.)", p_annotation->name.operator String(), Variant::get_type_name(t_type), export_type.to_string()), variable);
				return false;
			}
		}
	}
	return true;
}
template <PropertyUsageFlags t_usage>
bool GDScriptParser::export_group_annotations(const AnnotationNode *p_annotation, Node *p_node) {