Ajax loading modal window with pjax container doesn't work pjax.reload?

Question

Yii

I load into the DOM with the help of .append () the modal window in which pjax is located. The action returns data via renderAjax.
When trying to do $.pjax.reload({container: SELECTOR_PJAX_CART_CONTAINER, async: false});
an empty response is returned and redirected to this URL. I tried to specify the $.pjax.reload url in the parameters, as I googled somewhere, but it did not help.
If the modal window is rendered immediately, then everything naturally works.
Tell me where to dig?