window.onhashchange doesn't work in tampermonkey

Question

I'm learning Javascript, and I want to write a simple script in Tampermonkey, which will run when the URL fragment identifier changes. But the following function doesn't work when the identifier change. window.onhashchange doesn't work either. I'm convinced that the func() is not the reason.

window.addEventListener("hashchange", function (){
    alert("run");
    func();
});

But if I add this function for testing,

window.addEventListener("click", function (){
   console.log(window.location.hash);
});

The hash printed in the console changes with the identifier every time I click, as expected.

I have no idea if this is my problem or the website or the Tampermonkey.