Why doesn't Greasemonkey click on the button?

Question

JavaScript

All good.
Please tell me, there is one and the same script. At some point, the script clicks on a button on the site:

$('.read_htable input[name=bet]').val(parseFloat(current_bet).toFixed(8));
        var readBtn = $('.read_htable .clRead')[read_write];
        readBtn.click();

If you run this script through Tampermonkey, then the button is pressed, but if through Greasemonkey, it doesn't. Why?