### 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 (ClassDB::has_signal(p_native_type_string, p_member_name)) {
		return true;
	}
	if (ClassDB::has_property(p_native_type_string, p_member_name)) {
		return true;
	}
	if (ClassDB::has_integer_constant(p_native_type_string, p_member_name)) {
		return true;
	}
	if (p_member_name == CoreStringNames::get_singleton()->_script) {
		return true;
	}
	return false;
}
Error GDScriptAnalyzer::check_native_member_name_conflict(const StringName &p_member_name, const GDScriptParser::Node *p_member_node, const StringName &p_native_type_string) {
	if (has_member_name_conflict_in_native_type(p_member_name, p_native_type_string)) {
		push_error(vformat(R"(Member "%s" redefined (original in native class '%s'))", p_member_name, p_native_type_string), p_member_node);
		return ERR_PARSE_ERROR;
	}
	if (class_exists(p_member_name)) {
		push_error(vformat(R"(The member "%s" shadows a native class.)", p_member_name), p_member_node);
		return ERR_PARSE_ERROR;
	}
	if (GDScriptParser::get_builtin_type(p_member_name) != Variant::VARIANT_MAX) {
		push_error(vformat(R"(The member "%s" cannot have the same name as a builtin type.)", p_member_name), p_member_node);
		return ERR_PARSE_ERROR;
	}
	return OK;
}
Error GDScriptAnalyzer::check_class_member_name_conflict(const GDScriptParser::ClassNode *p_class_node, const StringName &p_member_name, const GDScriptParser::Node *p_member_node) {