### 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 (const AnnotationNode *E : p_variable->annotations) {
		print_annotation(E);
	}
	push_text("Variable ");
	print_identifier(p_variable->identifier);
	push_text(" : ");
	if (p_variable->datatype_specifier != nullptr) {
		print_type(p_variable->datatype_specifier);
	} else if (p_variable->infer_datatype) {
		push_text("<inferred type>");
	} else {
		push_text("Variant");
	}
	increase_indent();
	push_line();
	push_text("= ");
	if (p_variable->initializer == nullptr) {
		push_text("<default value>");
	} else {
		print_expression(p_variable->initializer);
	}
	push_line();
	if (p_variable->property != VariableNode::PROP_NONE) {
		if (p_variable->getter != nullptr) {
			push_text("Get");