Does not work with PHP 8+

Module does not import XLS from file, gives internal server error message:

An AJAX HTTP error occurred. HTTP Result Code: 500 Debugging information follows. Path: /batch?id=892&op=do_nojs&op=do StatusText: Internal Server Error ResponseText:

That's the only message, there are no errors in dblog, no errors in Apache's error.log

Only solution is to switch back from PHP 8.1 back to 7.4, can reproduce same error both on shared-hosting and on Windows machine localhost.

Applied patches
https://www.drupal.org/files/issues/2023-08-10/3241516-7.patch →
https://www.drupal.org/files/issues/feeds_xls-notice_undefined-2596779-4... →
https://www.drupal.org/files/issues/ignored-list-text-values-2651420-4.p... →

PHP 7.4 end-of-life support ended 9 months ago (28 Nov 2022)