[jQuery] [jQuery 1.3.1] Losing event handlers when appending same element multiple times

[jQuery] [jQuery 1.3.1] Losing event handlers when appending same element multiple times


Here is the code:
HTML:
<ul>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
</ul>
JS:
$(function(){
    var handle = $('<span>Click me</span>');
    handle.click(function() {
        alert('Thanks');
    });
    $('ul li').append(handle);
});
With jQuery 1.2.6, each time I click on any list's element it shows
alert. With 1.3.1 in FF3, Safari 3 & Opera 9.63 alert is only
displaying when I click on first element. In IE6,7 everything is ok.
Is this some kind of bug?