This block of code in src/Utilities/Arr.php recursively omits all array keys that have null values

if (is_array($value)) {
    $value = static::filter($value);
    continue;
}

When building OAS documentation, you often want to keep keys with null values to show that, for example, a return value in an API response payload may contain null values but still include the keys for those values.

My team has forked this repo as well as the vyuldashev/laravel-open-api package employing this one in order to get around the issue and correctly generate our Open API docs. In the fork we have commented out this block of code.