ImapProtocol.php:774 - Undefined array key 0

[zeddmaster]

Describe the bug
When using the chunk function, some messages do not have an element with index 0

Used config
IMAP_HOST=imap.mail.ru
IMAP_PORT=993

Code to Reproduce

My usage:

$mailQuery->chunked(function (MessageCollection $messages) {

            /** @var Message $message */
            foreach ($messages as $message) {
                $mailMessage = MessageSaver::save($message);
                $this->builder->save($mailMessage);
            }
        }, $this->chunkSize);

Vendor src:

// vendor/webklex/php-imap/src/Connection/Protocols/ImapProtocol.php:774

public function fetch(array|string $items, array|int $from, mixed $to = null, int|string $uid = IMAP::ST_UID): Response {
        if (is_array($from) && count($from) > 1) {
            $set = implode(',', $from);
        } elseif (is_array($from) && count($from) === 1) {
            $set = $from[0] . ':' . $from[0]; // <-- exception
        } elseif ($to === null) {
            $set = $from . ':' . $from;
        } elseif ($to == INF) {
            $set = $from . ':*';
        } else {
            $set = $from . ':' . (int)$to;
        }
        // ...
}

On dumping $from variable i get this value:

$from = [
  40 => "39083"
];

Screenshots

Desktop / Server (please complete the following information):

• OS: Ubuntu 22.04
• PHP: 8.3.17
• Version: 6.1.0
• Provider: mail.ru