I cant figure out why link preview of links sent by bot will not show even if ‘disable_web_page_preview’ is true.

$config = json_decode(file_get_contents('config.json'), true);

$botToken = $config['bot_token'];
$chatId = $config['chat_id'];
$link = "https://github.com/FFmpeg/FFmpeg"; // Der zu testende Link

// Funktion zum Senden einer Nachricht an Telegram
function sendMessage($botToken, $chatId, $message) {
    $url = "https://api.telegram.org/bot$botToken/sendMessage";

    $postFields = [
        'chat_id' => $chatId,
        'text' => $message,
        'disable_web_page_preview' => true // Sicherstellen, dass die Vorschau aktiviert ist
    ];

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($postFields));
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

    $result = curl_exec($ch);

    if ($result === false) {
        $error = curl_error($ch);
        curl_close($ch);
        return ['success' => false, 'error' => $error];
    } else {
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);
        return ['success' => true, 'http_code' => $httpCode, 'response' => $result];
    }
}

$response = sendMessage($botToken, $chatId, $link);

if ($response['success']) {
    echo "Nachricht erfolgreich gesendet. HTTP-Code: " . $response['http_code'];
    echo "Antwort: " . $response['response'];
} else {
    echo "Fehler beim Senden der Nachricht: " . $response['error'];
}