### 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

‮
}
				if (colon_pos == stripped_line.length() || stripped_line[colon_pos++] != ':') {
					continue; 
				}
				title = stripped_line.substr(open_bracket_pos, close_bracket_pos - open_bracket_pos).strip_edges();
				link = stripped_line.substr(colon_pos).strip_edges();
			}
			mode = TUTORIALS;
			in_codeblock = false;
		} else if (stripped_line.is_empty()) {
			continue;
		} else {
			
			if (mode == TUTORIALS) {
				mode = DONE;
			}
			in_codeblock = _in_codeblock(doc_line, in_codeblock, &codeblock_begins);
		}
		if (in_codeblock) {
			int i = 0;
			for (; i < codeblock_begins; i++) {
				if (doc_line[i] != ' ') {
					break;
				}
			}
			doc_line = doc_line.substr(i);
		} else {
			doc_line = stripped_line;
		}
		String line_join = (in_codeblock) ? "\n" : " ";