from v4 to v7 test failed when using mock()->makePartial()

[shokme]

Hey !

I'm upgrading to laravel9 and thus upgrading this package to v7 from v4, but I encounter an issue when I'm running tests:

TypeError : Illegal offset type in isset or empty
 /Users/shok/Web/hexeko-api/vendor/spatie/laravel-event-sourcing/src/EventHandlers/HandlesEvents.php:47
 /Users/shok/Web/hexeko-api/vendor/laravel/framework/src/Illuminate/Collections/Traits/EnumeratesValues.php:262
 /Users/shok/Web/hexeko-api/vendor/spatie/laravel-event-sourcing/src/EventHandlers/HandlesEvents.php:48
 /Users/shok/Web/hexeko-api/vendor/spatie/laravel-event-sourcing/src/Projectionist.php:298
 /Users/shok/Web/hexeko-api/vendor/spatie/laravel-event-sourcing/src/Projectionist.php:266
 /Users/shok/Web/hexeko-api/vendor/spatie/laravel-event-sourcing/src/Projectionist.php:227
 /Users/shok/Web/hexeko-api/vendor/spatie/laravel-event-sourcing/src/StoredEvents/HandleStoredEventJob.php:25
...

public function setUp(): void
{
    parent::setUp();
    $this->bookingRequestProjector = $this->mock(BookingRequestProjector::class)->makePartial();
}

public function test_something()
{
    $bookingRequest = $this->createBookingRequest($this->productSample, $this->bookerSample, new BookingConfiguration());
    $bookingRequest->refresh();
    $this->assertTrue($bookingRequest->hasEverHadStatus(BookingRequestStatus::started));
    $this->assertEquals(BookingRequestStatus::cancelled, $bookingRequest->status);
}

I have compared the documentation v4/v7 and it looks the same.

// createBookingRequest
...
event(new BookingRequestedEvent($bookingRequest->id));
...

This is what I found:
laravel-event-sourcing/src/EventHandlers/HandlesEvents.php

    public function handle(StoredEvent $storedEvent): void
    {
//        $eventClass = $storedEvent->event_class;
//
//        $handlersForEvent = $this->getEventHandlingMethods()->get($eventClass);
//
//        foreach ($handlersForEvent as $handler) {
//            $this->{$handler}($storedEvent->event);
//        }
//        return;
//
        $event = $storedEvent->event;

        Handlers::new($this)
            ->public()
            ->protected()
            ->accepts($event)
            ->all()
            ->each(function (Method $method) use ($event, &$i) {
                if (in_array($method->getName(),['mockery_getExpectationsFor', '__isset', '_mockery_findExpectedMethodHandler'])) {
                    return true;
                }
                $this->{$method->getName()}($event);
            });
    }

If I use the code from v5 (the commented one), it works and if I skip those methods in v7 ['mockery_getExpectationsFor', '__isset', '_mockery_findExpectedMethodHandler'] it also work.