### 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.
"trait",
		"namespace",
		"yield",
		nullptr
	};
	const char **w = _reserved_words;
	while (*w) {
		p_words->push_back(*w);
		w++;
	}
	List<StringName> functions;
	GDScriptUtilityFunctions::get_function_list(&functions);
	for (const StringName &E : functions) {
		p_words->push_back(String(E));
	}
}
bool GDScriptLanguage::is_control_flow_keyword(String p_keyword) const {
	return p_keyword == "break" ||
			p_keyword == "continue" ||
			p_keyword == "elif" ||
			p_keyword == "else" ||
			p_keyword == "if" ||
			p_keyword == "for" ||
			p_keyword == "match" ||
			p_keyword == "pass" ||
			p_keyword == "return" ||
			p_keyword == "while";
}
bool GDScriptLanguage::handles_global_class_type(const String &p_type) const {