### 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

‮
List<AnnotationNode *> annotations;
	while (!annotation_stack.is_empty()) {
		AnnotationNode *last_annotation = annotation_stack.back()->get();
		if (last_annotation->applies_to(p_target)) {
			annotations.push_front(last_annotation);
			annotation_stack.pop_back();
		} else {
			push_error(vformat(R"(Annotation "%s" cannot be applied to a %s.)", last_annotation->name, p_member_kind));
			clear_unused_annotations();
		}
#ifdef TOOLS_ENABLED
		if (last_annotation->start_line == doc_comment_line) {
			doc_comment_line--;
		}
#endif 
	}
	T *member = (this->*p_parse_function)();
	if (member == nullptr) {
		return;
	}
	for (AnnotationNode *&annotation : annotations) {
		member->annotations.push_back(annotation);
	}
#ifdef TOOLS_ENABLED
	
	class_doc_line = MIN(class_doc_line, doc_comment_line - 1);
	if (has_comment(doc_comment_line)) {
		if constexpr (std::is_same_v<T, ClassNode>) {
			get_class_doc_comment(doc_comment_line, member->doc_brief_description, member->doc_description, member->doc_tutorials, true);