### 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.
int begin_scan = String("@tutorial").length();
			if (begin_scan >= stripped_line.length()) {
				continue; 
			}
			if (stripped_line[begin_scan] == ':') { 
				
				title = "";
				link = stripped_line.trim_prefix("@tutorial:").strip_edges();
			} else {
				/* Syntax:
				 *   @tutorial ( The Title Here )         :         https://the.url/
				 *             ^ open           ^ close   ^ colon   ^ url
				 */
				int open_bracket_pos = begin_scan, close_bracket_pos = 0;
				while (open_bracket_pos < stripped_line.length() && (stripped_line[open_bracket_pos] == ' ' || stripped_line[open_bracket_pos] == '\t')) {
					open_bracket_pos++;
				}
				if (open_bracket_pos == stripped_line.length() || stripped_line[open_bracket_pos++] != '(') {
					continue; 
				}
				close_bracket_pos = open_bracket_pos;
				while (close_bracket_pos < stripped_line.length() && stripped_line[close_bracket_pos] != ')') {
					close_bracket_pos++;
				}
				if (close_bracket_pos == stripped_line.length()) {
					continue; 
				}
				int colon_pos = close_bracket_pos + 1;
				while (colon_pos < stripped_line.length() && (stripped_line[colon_pos] == ' ' || stripped_line[colon_pos] == '\t')) {
					colon_pos++;