### Godot version

4.0-rc1

### System information

Windows 10

### Issue description

The code: `@export @onready var camera_system : Node3D`

Is throwing: `Line 5:The "@onready" annotation will make the default value to be set after the "@export" takes effect and will override it. (Warning treated as error.)` and is crashing the game.

Unchecking "Treat Warning as Errors" seems to have no effect:

![imagen](https://user-images.githubusercontent.com/248383/217900756-8e214c40-68fb-4fb2-8509-a1e689725930.png)

![imagen](https://user-images.githubusercontent.com/248383/217901253-3b758ebc-48e9-40fe-8d77-16fce7cbae88.png)


### Steps to reproduce

- Write `@export @onready var some_var : Node3D`
- In Project Settings, uncheck `Treat Warning as Errors`
- Try to run the project, a `Parser Error` will be thrown.

### Minimal reproduction project

It's as simple as adding one line of code, so I'm not sure a MRP is needed.
can_continue = true;
	SuiteNode *suite = alloc_node<SuiteNode>();
	if (n_for->variable) {
		const SuiteNode::Local &local = current_suite->get_local(n_for->variable->name);
		if (local.type != SuiteNode::Local::UNDEFINED) {
			push_error(vformat(R"(There is already a %s named "%s" declared in this scope.)", local.get_name(), n_for->variable->name), n_for->variable);
		}
		suite->add_local(SuiteNode::Local(n_for->variable, current_function));
	}
	n_for->loop = parse_suite(R"("for" block)", suite);
	n_for->loop->is_loop = true;
	complete_extents(n_for);
	
	can_break = could_break;
	can_continue = could_continue;
	return n_for;
}
GDScriptParser::IfNode *GDScriptParser::parse_if(const String &p_token) {
	IfNode *n_if = alloc_node<IfNode>();
	n_if->condition = parse_expression(false);
	if (n_if->condition == nullptr) {
		push_error(vformat(R"(Expected conditional expression after "%s".)", p_token));
	}
	consume(GDScriptTokenizer::Token::COLON, vformat(R"(Expected ":" after "%s" condition.)", p_token));
	n_if->true_block = parse_suite(vformat(R"("%s" block)", p_token));
	n_if->true_block->parent_if = n_if;
	if (n_if->true_block->has_continue) {
		current_suite->has_continue = true;
	}
	if (match(GDScriptTokenizer::Token::ELIF)) {