### 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.
identifier->constant_source = declaration.constant;
				declaration.constant->usages++;
				break;
			case SuiteNode::Local::VARIABLE:
				identifier->source = IdentifierNode::LOCAL_VARIABLE;
				identifier->variable_source = declaration.variable;
				declaration.variable->usages++;
				break;
			case SuiteNode::Local::PARAMETER:
				identifier->source = IdentifierNode::FUNCTION_PARAMETER;
				identifier->parameter_source = declaration.parameter;
				declaration.parameter->usages++;
				break;
			case SuiteNode::Local::FOR_VARIABLE:
				identifier->source = IdentifierNode::LOCAL_ITERATOR;
				identifier->bind_source = declaration.bind;
				declaration.bind->usages++;
				break;
			case SuiteNode::Local::PATTERN_BIND:
				identifier->source = IdentifierNode::LOCAL_BIND;
				identifier->bind_source = declaration.bind;
				declaration.bind->usages++;
				break;
			case SuiteNode::Local::UNDEFINED:
				ERR_FAIL_V_MSG(nullptr, "Undefined local found.");
		}
	}
	return identifier;
}
GDScriptParser::LiteralNode *GDScriptParser::parse_literal() {