### 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_type.builtin_type = Variant::INT;
	} else if (p_for->list) {
		resolve_node(p_for->list, false);
		GDScriptParser::DataType list_type = p_for->list->get_datatype();
		if (!list_type.is_hard_type()) {
			mark_node_unsafe(p_for->list);
		}
		if (list_type.is_variant()) {
			variable_type.kind = GDScriptParser::DataType::VARIANT;
			mark_node_unsafe(p_for->list);
		} else if (list_type.has_container_element_type()) {
			variable_type = list_type.get_container_element_type();
			variable_type.type_source = list_type.type_source;
		} else if (list_type.is_typed_container_type()) {
			variable_type = list_type.get_typed_container_type();
			variable_type.type_source = list_type.type_source;
		} else if (list_type.builtin_type == Variant::INT || list_type.builtin_type == Variant::FLOAT || list_type.builtin_type == Variant::STRING) {
			variable_type.type_source = list_type.type_source;
			variable_type.kind = GDScriptParser::DataType::BUILTIN;
			variable_type.builtin_type = list_type.builtin_type;
		} else if (list_type.builtin_type == Variant::VECTOR2I || list_type.builtin_type == Variant::VECTOR3I) {
			variable_type.type_source = list_type.type_source;
			variable_type.kind = GDScriptParser::DataType::BUILTIN;
			variable_type.builtin_type = Variant::INT;
		} else if (list_type.builtin_type == Variant::VECTOR2 || list_type.builtin_type == Variant::VECTOR3) {
			variable_type.type_source = list_type.type_source;
			variable_type.kind = GDScriptParser::DataType::BUILTIN;
			variable_type.builtin_type = Variant::FLOAT;
		} else if (list_type.builtin_type == Variant::OBJECT) {
			GDScriptParser::DataType return_type;