### 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 (GDScriptLanguage::get_singleton()->has_any_global_constant(name)) {
		Variant constant = GDScriptLanguage::get_singleton()->get_any_global_constant(name);
		p_identifier->set_datatype(type_from_variant(constant, p_identifier));
		p_identifier->is_constant = true;
		p_identifier->reduced_value = constant;
		return;
	}
	
	
	if (GDScriptUtilityFunctions::function_exists(name)) {
		push_error(vformat(R"(Built-in function "%s" cannot be used as an identifier.)", name), p_identifier);
	} else {
		push_error(vformat(R"(Identifier "%s" not declared in the current scope.)", name), p_identifier);
	}
	GDScriptParser::DataType dummy;
	dummy.kind = GDScriptParser::DataType::VARIANT;
	p_identifier->set_datatype(dummy); 
}
void GDScriptAnalyzer::reduce_lambda(GDScriptParser::LambdaNode *p_lambda) {
	
	GDScriptParser::DataType lambda_type;
	lambda_type.type_source = GDScriptParser::DataType::ANNOTATED_INFERRED;
	lambda_type.kind = GDScriptParser::DataType::BUILTIN;
	lambda_type.builtin_type = Variant::CALLABLE;
	p_lambda->set_datatype(lambda_type);
	if (p_lambda->function == nullptr) {
		return;
	}
	lambda_stack.push_back(p_lambda);
	resolve_function_signature(p_lambda->function, p_lambda, true);