### 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.
DocData::method_doc_from_methodinfo(method_doc, methods[i], doc_functions[methods[i].name]);
		} else {
			DocData::method_doc_from_methodinfo(method_doc, methods[i], String());
		}
		doc.methods.push_back(method_doc);
	}
	List<PropertyInfo> props;
	_get_script_property_list(&props, false);
	for (int i = 0; i < props.size(); i++) {
		if (props[i].usage & PROPERTY_USAGE_CATEGORY || props[i].usage & PROPERTY_USAGE_GROUP || props[i].usage & PROPERTY_USAGE_SUBGROUP) {
			continue;
		}
		ScriptMemberInfo scr_member_info;
		scr_member_info.propinfo = props[i];
		scr_member_info.propinfo.usage |= PROPERTY_USAGE_NIL_IS_VARIANT;
		if (member_indices.has(props[i].name)) {
			const MemberInfo &mi = member_indices[props[i].name];
			scr_member_info.setter = mi.setter;
			scr_member_info.getter = mi.getter;
			if (mi.data_type.kind == GDScriptDataType::GDSCRIPT) {
				scr_member_info.propinfo.class_name = _get_gdscript_reference_class_name(
						Object::cast_to<GDScript>(mi.data_type.script_type));
			}
		}
		if (member_default_values.has(props[i].name)) {
			scr_member_info.has_default_value = true;
			scr_member_info.default_value = member_default_values[props[i].name];
		}
		if (doc_variables.has(props[i].name)) {
			scr_member_info.doc_string = doc_variables[props[i].name];