### 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.
ERR_FAIL_COND_V_MSG(p_node->type != Node::FUNCTION, false, vformat(R"("%s" annotation can only be applied to functions.)", p_annotation->name));
	FunctionNode *function = static_cast<FunctionNode *>(p_node);
	if (function->rpc_config.get_type() != Variant::NIL) {
		push_error(R"(RPC annotations can only be used once per function.)", p_annotation);
		return false;
	}
	Dictionary rpc_config;
	rpc_config["rpc_mode"] = MultiplayerAPI::RPC_MODE_AUTHORITY;
	if (!p_annotation->resolved_arguments.is_empty()) {
		int last = p_annotation->resolved_arguments.size() - 1;
		if (p_annotation->resolved_arguments[last].get_type() == Variant::INT) {
			rpc_config["channel"] = p_annotation->resolved_arguments[last].operator int();
			last -= 1;
		}
		if (last > 3) {
			push_error(R"(Invalid RPC arguments. At most 4 arguments are allowed, where only the last argument can be an integer to specify the channel.')", p_annotation);
			return false;
		}
		unsigned char locality_args = 0;
		unsigned char permission_args = 0;
		unsigned char transfer_mode_args = 0;
		for (int i = last; i >= 0; i--) {
			String arg = p_annotation->resolved_arguments[i].operator String();
			if (arg == "call_local") {
				locality_args++;
				rpc_config["call_local"] = true;
			} else if (arg == "call_remote") {
				locality_args++;
				rpc_config["call_local"] = false;
			} else if (arg == "any_peer") {