I might have to switch to a search after don't you think it's better?

We no longer recommend using the scroll API for deep pagination. If you need to preserve the index state while paging through more than 10,000 hits, use the search_after parameter with a point in time (PIT).

Didn't pay attention to this warning.

Unfortunately for me my ES server is on 7.9 version.
And right now I have an issue when I loop over a scroll

$count = 1;
foreach ($scroll as $scrollId => $resultSet) {
    foreach ($resultSet->getResults() as $result) {
        $this->logger->info(
            'Loop {count} with "{docsCount}" documents over scroll {scrollId}.',
            [
                'count' => $count,
                'docsCount' => $resultSet->count(),
                'scrollId' => $scrollId,
            ]
        );
        yield $result->getData();
    }
      $count;
}
$scroll->clear();

But the iteration stops close to the ends. I have 9757 docs matching my search and it stops on loop 824.
The scroll expiry time is set to 10m but it doesn't take 10m to loop.
Do you have any idea why this problem occurs?