### 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.
if (export_type.builtin_type == Variant::INT) {
			variable->export_info.type = Variant::INT;
		}
	}
	if (p_annotation->name == SNAME("@export_multiline")) {
		if (export_type.builtin_type == Variant::ARRAY && export_type.has_container_element_type()) {
			DataType inner_type = export_type.get_container_element_type();
			if (inner_type.builtin_type != Variant::STRING) {
				push_error(vformat(R"("%s" annotation on arrays requires a string type but type "%s" was given instead.)", p_annotation->name.operator String(), inner_type.to_string()), variable);
				return false;
			}
			String hint_prefix = itos(inner_type.builtin_type) + "/" + itos(variable->export_info.hint);
			variable->export_info.hint = PROPERTY_HINT_TYPE_STRING;
			variable->export_info.hint_string = hint_prefix + ":" + variable->export_info.hint_string;
			variable->export_info.type = Variant::ARRAY;
			return true;
		} else if (export_type.builtin_type == Variant::DICTIONARY) {
			variable->export_info.type = Variant::DICTIONARY;
			return true;
		} else if (export_type.builtin_type == Variant::PACKED_STRING_ARRAY) {
			String hint_prefix = itos(Variant::STRING) + "/" + itos(variable->export_info.hint);
			variable->export_info.hint = PROPERTY_HINT_TYPE_STRING;
			variable->export_info.hint_string = hint_prefix + ":" + variable->export_info.hint_string;
			variable->export_info.type = Variant::PACKED_STRING_ARRAY;
			return true;
		}
	}
	if (p_annotation->name == SNAME("@export")) {
		if (variable->datatype_specifier == nullptr && variable->initializer == nullptr) {
			push_error(R"(Cannot use simple "@export" annotation with variable without type or initializer, since type can't be inferred.)", p_annotation);