### 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.type = Variant::ARRAY;
			return true;
		} else if (export_type.builtin_type == Variant::DICTIONARY) {
			variable->export_info.type = Variant::DICTIONARY;
			return true;
		}
	}
	if (p_annotation->name == SNAME("@export")) {
		if (variable->datatype_specifier == nullptr && variable->initializer == nullptr) {
			push_error(R"(Cannot use simple "@export" annotation with variable without type or initializer, since type can't be inferred.)", p_annotation);
			return false;
		}
		bool is_array = false;
		if (export_type.builtin_type == Variant::ARRAY && export_type.has_container_element_type()) {
			export_type = export_type.get_container_element_type(); 
			is_array = true;
		}
		if (export_type.is_variant() || export_type.has_no_type()) {
			push_error(R"(Cannot use simple "@export" annotation because the type of the initialized value can't be inferred.)", p_annotation);
			return false;
		}
		switch (export_type.kind) {
			case GDScriptParser::DataType::BUILTIN:
				variable->export_info.type = export_type.builtin_type;
				variable->export_info.hint = PROPERTY_HINT_NONE;
				variable->export_info.hint_string = Variant::get_type_name(export_type.builtin_type);
				break;
			case GDScriptParser::DataType::NATIVE:
				if (ClassDB::is_parent_class(export_type.native_type, SNAME("Resource"))) {
					variable->export_info.type = Variant::OBJECT;