### 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

‮
int begin_scan = String("@tutorial").length();
			if (begin_scan >= stripped_line.length()) {
				continue; 
			}
			if (stripped_line[begin_scan] == ':') { 
				
				title = "";
				link = stripped_line.trim_prefix("@tutorial:").strip_edges();
			} else {
				/* Syntax:
				 *   @tutorial ( The Title Here )         :         https://the.url/
				 *             ^ open           ^ close   ^ colon   ^ url
				 */
				int open_bracket_pos = begin_scan, close_bracket_pos = 0;
				while (open_bracket_pos < stripped_line.length() && (stripped_line[open_bracket_pos] == ' ' || stripped_line[open_bracket_pos] == '\t')) {
					open_bracket_pos++;
				}
				if (open_bracket_pos == stripped_line.length() || stripped_line[open_bracket_pos++] != '(') {
					continue; 
				}
				close_bracket_pos = open_bracket_pos;
				while (close_bracket_pos < stripped_line.length() && stripped_line[close_bracket_pos] != ')') {
					close_bracket_pos++;
				}
				if (close_bracket_pos == stripped_line.length()) {
					continue; 
				}
				int colon_pos = close_bracket_pos + 1;
				while (colon_pos < stripped_line.length() && (stripped_line[colon_pos] == ' ' || stripped_line[colon_pos] == '\t')) {
					colon_pos++;