### 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

‮
member.m_enum->set_datatype(resolving_datatype);
				GDScriptParser::DataType enum_type = make_enum_type(member.m_enum->identifier->name, p_class->fqcn, true);
				const GDScriptParser::EnumNode *prev_enum = current_enum;
				current_enum = member.m_enum;
				Dictionary dictionary;
				for (int j = 0; j < member.m_enum->values.size(); j++) {
					GDScriptParser::EnumNode::Value &element = member.m_enum->values.write[j];
					if (element.custom_value) {
						reduce_expression(element.custom_value);
						if (!element.custom_value->is_constant) {
							push_error(R"(Enum values must be constant.)", element.custom_value);
						} else if (element.custom_value->reduced_value.get_type() != Variant::INT) {
							push_error(R"(Enum values must be integers.)", element.custom_value);
						} else {
							element.value = element.custom_value->reduced_value;
							element.resolved = true;
						}
					} else {
						if (element.index > 0) {
							element.value = element.parent_enum->values[element.index - 1].value + 1;
						} else {
							element.value = 0;
						}
						element.resolved = true;
					}
					enum_type.enum_values[element.identifier->name] = element.value;
					dictionary[String(element.identifier->name)] = element.value;
				}
				current_enum = prev_enum;
				dictionary.make_read_only();