### 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

‮
for (int i = 0; i < p_array->elements.size(); i++) {
		GDScriptParser::ExpressionNode *element = p_array->elements[i];
		if (element->type == GDScriptParser::Node::ARRAY) {
			const_fold_array(static_cast<GDScriptParser::ArrayNode *>(element), p_is_const);
		} else if (element->type == GDScriptParser::Node::DICTIONARY) {
			const_fold_dictionary(static_cast<GDScriptParser::DictionaryNode *>(element), p_is_const);
		}
		if (!element->is_constant) {
			return;
		}
	}
	Array array;
	array.resize(p_array->elements.size());
	for (int i = 0; i < p_array->elements.size(); i++) {
		array[i] = p_array->elements[i]->reduced_value;
	}
	if (p_is_const) {
		array.make_read_only();
	}
	p_array->is_constant = true;
	p_array->reduced_value = array;
}
void GDScriptAnalyzer::const_fold_dictionary(GDScriptParser::DictionaryNode *p_dictionary, bool p_is_const) {