### 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

‮
BRIEF,
		DESC,
		TUTORIALS,
		DONE,
	};
	Mode mode = BRIEF;
	if (p_inner_class) {
		while (comments.has(line - 1)) {
			if (!comments[line - 1].new_line || !comments[line - 1].comment.begins_with("##")) {
				break;
			}
			line--;
		}
	}
	int codeblock_begins = 0;
	while (comments.has(line)) {
		if (!comments[line].new_line || !comments[line].comment.begins_with("##")) {
			break;
		}
		String title, link; 
		String doc_line = comments[line++].comment.trim_prefix("##");
		String stripped_line = doc_line.strip_edges();
		
		if (stripped_line.is_empty() && mode == BRIEF && !p_brief.is_empty()) {
			mode = DESC;
			continue;
		} else if (stripped_line.begins_with("@tutorial")) {