A keydown event succeeds for an English letter but not for an Hebrew one, sharing the same key

I am trying to listen to the event in which the keyboard key containing the Hebrew final-letter ך is pressed.

This key stands for both the English letter L and the Hebrew final letter ך.

If my operating system works in English mode, the following code works for L, but if I change the language mode to Hebrew, the code doesn't work for ך.

window.addEventListener('keydown', function(event) {
  if (event.ctrlKey && event.altKey && event.key === 'l' || event.ctrlKey && event.altKey && event.key === 'ך') {
    document.querySelector(".cbntphone_icon").style.display = "none";
  }
});

There is no error in the browser console when I click CTRL+ALT+ך.

Why would the code work only for the English letter?