### 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

‮
static constexpr const char *kind = "variable";
	resolve_assignable(p_variable, kind);
#ifdef DEBUG_ENABLED
	if (p_is_local) {
		if (p_variable->usages == 0 && !String(p_variable->identifier->name).begins_with("_")) {
			parser->push_warning(p_variable, GDScriptWarning::UNUSED_VARIABLE, p_variable->identifier->name);
		} else if (p_variable->assignments == 0) {
			parser->push_warning(p_variable, GDScriptWarning::UNASSIGNED_VARIABLE, p_variable->identifier->name);
		}
		is_shadowing(p_variable->identifier, kind);
	}
#endif
}
void GDScriptAnalyzer::resolve_constant(GDScriptParser::ConstantNode *p_constant, bool p_is_local) {
	static constexpr const char *kind = "constant";
	resolve_assignable(p_constant, kind);
#ifdef DEBUG_ENABLED
	if (p_is_local) {
		if (p_constant->usages == 0) {
			parser->push_warning(p_constant, GDScriptWarning::UNUSED_LOCAL_CONSTANT, p_constant->identifier->name);
		}
		is_shadowing(p_constant->identifier, kind);
	}
#endif
}
void GDScriptAnalyzer::resolve_parameter(GDScriptParser::ParameterNode *p_parameter) {