### 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

‮
ERR_FAIL_COND_MSG(p_node == nullptr, "Trying to resolve type of a null node.");
	switch (p_node->type) {
		case GDScriptParser::Node::NONE:
			break; 
		case GDScriptParser::Node::CLASS:
			if (OK == resolve_class_inheritance(static_cast<GDScriptParser::ClassNode *>(p_node), true)) {
				resolve_class_interface(static_cast<GDScriptParser::ClassNode *>(p_node), true);
				resolve_class_body(static_cast<GDScriptParser::ClassNode *>(p_node), true);
			}
			break;
		case GDScriptParser::Node::CONSTANT:
			resolve_constant(static_cast<GDScriptParser::ConstantNode *>(p_node), true);
			break;
		case GDScriptParser::Node::FOR:
			resolve_for(static_cast<GDScriptParser::ForNode *>(p_node));
			break;
		case GDScriptParser::Node::IF:
			resolve_if(static_cast<GDScriptParser::IfNode *>(p_node));
			break;
		case GDScriptParser::Node::SUITE:
			resolve_suite(static_cast<GDScriptParser::SuiteNode *>(p_node));
			break;
		case GDScriptParser::Node::VARIABLE: