### 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

‮
if (expression_type.is_variant() && !is_enum_cast && !is_type_compatible(p_type, value_type, true, p_expression)) {
		push_error(vformat(R"(Cannot %s a value of type "%s" as "%s".)", p_usage, value_type.to_string(), p_type.to_string()), p_expression);
		return;
	}
#ifdef DEBUG_ENABLED
	if (p_type.kind == GDScriptParser::DataType::ENUM && value_type.builtin_type == Variant::INT && !enum_has_value(p_type, p_expression->reduced_value)) {
		parser->push_warning(p_expression, GDScriptWarning::INT_AS_ENUM_WITHOUT_MATCH, p_usage, p_expression->reduced_value.stringify(), p_type.to_string());
	}
#endif
	if (value_type.builtin_type == p_type.builtin_type) {
		p_expression->set_datatype(p_type);
		return;
	}
	Variant converted_to;
	const Variant *converted_from = &p_expression->reduced_value;
	Callable::CallError call_error;
	Variant::construct(p_type.builtin_type, converted_to, &converted_from, 1, call_error);
	if (call_error.error) {
		push_error(vformat(R"(Failed to convert a value of type "%s" to "%s".)", value_type.to_string(), p_type.to_string()), p_expression);
		return;
	}
#ifdef DEBUG_ENABLED
	if (p_type.builtin_type == Variant::INT && value_type.builtin_type == Variant::FLOAT) {
		parser->push_warning(p_expression, GDScriptWarning::NARROWING_CONVERSION);
	}
#endif
	p_expression->reduced_value = converted_to;
	p_expression->set_datatype(p_type);
}
void GDScriptAnalyzer::update_array_literal_element_type(const GDScriptParser::DataType &p_base_type, GDScriptParser::ArrayNode *p_array_literal) {