### 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.
RBSet<GDScript *> dependencies = get_dependencies();
	RBSet<GDScript *> must_clear_dependencies;
	HashMap<GDScript *, RBSet<GDScript *>> inverted_dependencies;
	for (GDScript *E : dependencies) {
		inverted_dependencies.insert(E, E->get_inverted_dependencies());
	}
	RBSet<GDScript *> cant_clear;
	for (KeyValue<GDScript *, RBSet<GDScript *>> &E : inverted_dependencies) {
		for (GDScript *F : E.value) {
			if (!dependencies.has(F)) {
				cant_clear.insert(E.key);
				for (GDScript *G : E.key->get_dependencies()) {
					cant_clear.insert(G);
				}
				break;
			}
		}
	}
	for (KeyValue<GDScript *, RBSet<GDScript *>> &E : inverted_dependencies) {
		if (cant_clear.has(E.key) || ScriptServer::is_global_class(E.key->get_fully_qualified_name())) {
			continue;
		}
		must_clear_dependencies.insert(E.key);
	}
	cant_clear.clear();
	dependencies.clear();
	inverted_dependencies.clear();
	return must_clear_dependencies;
}
bool GDScript::has_script_signal(const StringName &p_signal) const {