[nullsafety] Cannot disable field initialization check with @:nullSafety(Off)

[haxiomic]

I have a case where I know all fields will be initialized when accessing this, but I cannot disable the nullSafety error for that case:
Tested in haxe 4.0.5, 4.1.2 and latest development to c862176

import js.lib.Promise;

@:nullSafety
class Main {

	final field: String;

	public function new() {
		new Promise((resolve, reject) -> {
			@:nullSafety(Off) method(); // still errors
		});
		field = 'hello';
	}

	function method() {
		
	}

	static function main() new Main();

}

Error is
Main.hx:10: characters 22-28 : Null safety: Cannot use "this" until all instance fields are initialized.

Attached repro

(While in this example I could just move field initialization before the promise, in my project that is not possible)

null-safety-issue.zip