### 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

‮
p_binary_op->reduced_value = true;
				}
			} else {
				ERR_PRINT("Parser bug: unknown binary operation.");
			}
		}
		p_binary_op->set_datatype(type_from_variant(p_binary_op->reduced_value, p_binary_op));
		return;
	}
	GDScriptParser::DataType result;
	if (p_binary_op->operation == GDScriptParser::BinaryOpNode::OP_TYPE_TEST) {
		GDScriptParser::DataType test_type = right_type;
		test_type.is_meta_type = false;
		if (!is_type_compatible(test_type, left_type) && !is_type_compatible(left_type, test_type)) {
			if (left_type.is_hard_type()) {
				push_error(vformat(R"(Expression is of type "%s" so it can't be of type "%s".)", left_type.to_string(), test_type.to_string()), p_binary_op->left_operand);
			} else {
				
				mark_node_unsafe(p_binary_op);
			}
		}
		
		result.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
		result.kind = GDScriptParser::DataType::BUILTIN;
		result.builtin_type = Variant::BOOL;
	} else if ((p_binary_op->variant_op == Variant::OP_EQUAL || p_binary_op->variant_op == Variant::OP_NOT_EQUAL) &&
			((left_type.kind == GDScriptParser::DataType::BUILTIN && left_type.builtin_type == Variant::NIL) || (right_type.kind == GDScriptParser::DataType::BUILTIN && right_type.builtin_type == Variant::NIL))) {
		
		result.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
		result.kind = GDScriptParser::DataType::BUILTIN;