Issuing with CRON invoices does not work on the settings of the PL-PL region

The problem will reach both settings:
On Server Side (PHP)

I also do not understand the message that is displayed all the time even on printed farms.
...
Recurring Invoice
The Will Be Automatically Generate New Invoice Every 6 Months (Semiannuly) system.
Cron job must be setup other invoice will be generated.
...

...
$ php82 artisan app:generate-invoice
...
...
Call to a member function subDays() on string

at app/Console/Commands/CreateRecurringInvoices.php:31
27▕ $query->whereNull('next_create_date')->orWhere('next_create_date', '<=', now()->format('Y-m-d'));
28▕ })->get()->filter(function ($recurring_invoice) {
29▕ $date = $recurring_invoice->last_created_at ? $recurring_invoice->last_created_at : $recurring_invoice->date;
30▕ if ($recurring_invoice->create_before) {
➜ 31▕ $date = $recurring_invoice->create_before == 1 ? $date->subDay() : $date->subDays($recurring_invoice->create_before);
32▕ }
33▕
34▕ if ($recurring_invoice->repeat) {
35▕ return $this->{$recurring_invoice->repeat}($date);

1 [internal]:0
App\Console\Commands\CreateRecurringInvoices::App\Console\Commands\{closure}(Object(App\Models\Invoice))
+2 vendor frames

4 app/Console/Commands/CreateRecurringInvoices.php:28
Illuminate\Support\Collection::filter(Object(Closure))
...