Why empty $this inside the model?

Question

Laravel

Hello. Faced with the fact that after transferring to another server, the application stopped working. Found out that none of the methods of getting dependencies works, because. $this contains an empty model.
For example, one of the methods of the User class

public function dialogs()
    {
        dd($this);
        return $this->belongsToMany('App\Models\Dialog', 'dialog_user', 'userId', 'dialogId');
    }

on the old server in $this is the user

on the new one - an empty object

in which direction to dig?
UPD.
Controller method

public function getDialogs()
    {
        $user = Auth::user();
        $dialogs = $this->dialogService->getDialogs($user);
        return response()->json($dialogs);
    }

dialogService->getDialogs()

public function getDialogs(User $user)
    {
        $user->load(['dialogs' => function($query) {
            $query->latest('updated_at');
        }]);
        if (!count($user->dialogs)) {
            $responseHelper = new SendJsonResponse();
            $responseHelper->sendWithError('no_dialogs');
        }
        
        return $user->dialogs;
    }

Answer 1

Because you have it empty, that's all.
No data received - no data