### 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

‮
indent_level++;
	indent = "";
	for (int i = 0; i < indent_level * 4; i++) {
		if (i % 4 == 0) {
			indent += "|";
		} else {
			indent += " ";
		}
	}
}
void GDScriptParser::TreePrinter::decrease_indent() {
	indent_level--;
	indent = "";
	for (int i = 0; i < indent_level * 4; i++) {
		if (i % 4 == 0) {
			indent += "|";
		} else {
			indent += " ";
		}
	}
}
void GDScriptParser::TreePrinter::push_line(const String &p_line) {
	if (!p_line.is_empty()) {
		push_text(p_line);
	}
	printed += "\n";
	pending_indent = true;
}
void GDScriptParser::TreePrinter::push_text(const String &p_text) {