### Godot version

4.0.2.stable.mono

### System information

Windows 10 - 4.0.2.stable.mono - Any Renderer

### Issue description

In a script with an `@export` variable (with a non-default value), Godot will replace the first variable in the category with the same name. For example, if you're exporting a variable called "Vector", and the value is set to a non-default value, the first variable in the category called "Vector" will also be changed to the same value.

### Steps to reproduce

Attach said script to a node:
```
extends Node

@export var Vector: Vector2
@export_category("Vector")
@export var Var2: float = 1

func _process(delta):
	print(Var2)
```
When changing the value of the `Vector` export variable, the variable Var2 will contain the same value. This does not happen when the `@export_category` has a different name.

### Minimal reproduction project

N/A
} break;
		case GDScriptParser::DataType::NATIVE: {
			result.kind = GDScriptDataType::NATIVE;
			result.native_type = p_datatype.native_type;
			result.builtin_type = p_datatype.builtin_type;
		} break;
		case GDScriptParser::DataType::SCRIPT: {
			result.kind = GDScriptDataType::SCRIPT;
			result.builtin_type = p_datatype.builtin_type;
			result.script_type_ref = p_datatype.script_type;
			result.script_type = result.script_type_ref.ptr();
			result.native_type = p_datatype.native_type;
		} break;
		case GDScriptParser::DataType::CLASS: {
			result.kind = GDScriptDataType::GDSCRIPT;
			result.builtin_type = p_datatype.builtin_type;
			result.native_type = p_datatype.native_type;
			bool is_local_class = parser->has_class(p_datatype.class_type);
			Ref<GDScript> script;
			if (is_local_class) {
				script = Ref<GDScript>(main_script);
			} else {
				Error err = OK;
				script = GDScriptCache::get_shallow_script(p_datatype.script_path, err, p_owner->path);
				if (err) {
					_set_error(vformat(R"(Could not find script "%s": %s)", p_datatype.script_path, error_names[err]), nullptr);
				}
			}
			if (script.is_valid()) {
				script = Ref<GDScript>(script->find_class(p_datatype.class_type->fqcn));