### 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.
while (current.type == GDScriptTokenizer::Token::ERROR) {
		push_error(current.literal);
		current = tokenizer.scan();
	}
	for (Node *n : nodes_in_progress) {
		update_extents(n);
	}
	return previous;
}
bool GDScriptParser::match(GDScriptTokenizer::Token::Type p_token_type) {
	if (!check(p_token_type)) {
		return false;
	}
	advance();
	return true;
}
bool GDScriptParser::check(GDScriptTokenizer::Token::Type p_token_type) const {
	if (p_token_type == GDScriptTokenizer::Token::IDENTIFIER) {
		return current.is_identifier();
	}
	return current.type == p_token_type;
}
bool GDScriptParser::consume(GDScriptTokenizer::Token::Type p_token_type, const String &p_error_message) {
	if (match(p_token_type)) {
		return true;
	}
	push_error(p_error_message);
	return false;
}
bool GDScriptParser::is_at_end() const {