@:volatile not honored by --jvm

[acarioni]

Environment
macos monterey 12.1
haxe 4.2.4

When code like the following is compiled with the option --jvm, haxe forgets the volatile modifier.

class Main {
  @:volatile var x: Int;
}

The output of javap shows that the volatile modifier is not present:

Compiled from "foo/Main.hx"
public class foo.Main extends haxe.jvm.Object {
  public int x;
  public static void main(java.lang.String[]);
  public static void main();
  public foo.Main(haxe.jvm.EmptyConstructor);
  public java.lang.Object _hx_getField(java.lang.String);
  public void _hx_setField(java.lang.String, java.lang.Object);
}