NULL Filtering not working

[RobertoLanzeni]

Hi there.
I'm using this amazing package , but I'm not finding way to filter field as null:

This is URL :
http://127.0.0.1:8001/filterTest?filter[paziente.cognome]=LANZ&filter[stato_pratica]=3&filter[medico.users.name]=Roberto&filter[data_prericovero]=2022

if i set null at latest filter , it returns anything.
I also used this approach : AllowedFilter::exact('data_prericovero')->default(null), but anything has changed.

How can I reach this goal?
Tanks Roberto

[AlexMcowkin]

it was broken in the last 5th version.
the problem is in QueryBuilderRequest() method

    protected function getRequestData(?string $key = null, $default = null)
    {
        if (config('query-builder.request_data_source') === 'body') {
            return $this->input($key, $default);
        }

        return $this->get($key, $default); // this is new in the 5th version
        
        return $this->query($key, $default); // this was earlier
    }