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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>remove after lock</title>

</head>

<body>

  <h1>remove() after lock()</h1>

  <pre id="out"></pre>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    (function () {

      var lines = [];

      var callbacks = $.Callbacks();

      var handler = function () { lines.push("Still registered"); };



      callbacks.add(handler);

      callbacks.lock();

      callbacks.remove(handler);

      callbacks.fire();



      document.getElementById("out").textContent = lines.join("\n");

    })();

  </script>

</body>

</html>

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jQuery callbacks.remove() — blocked after lock (Try It)