Livewire doesn't show value from mutator - laravel

Question

I'm trying to bind a date field (mydate) with laravel livewire. Basically I did the following:
In the model, I did a cast and created a mutator and an accessor:
<?php
namespace App\Models\Models;
use Carbon\Carbon;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
class Platform extends Model
{
use HasFactory;
protected $fillable = ['name', 'mydate'];
protected $dates = ['created_at', 'updated_at', 'mydate'];
protected $casts = ['mydate' => 'datetime'];
public function getCreatedAtBrAttribute()
{
return optional($this->created_at)->format('d/m/Y H:i');
}
public function getUpdatedAtBrAttribute()
{
return optional($this->updated_at)->format('d/m/Y H:i');
}
public function getMydateBrAttribute()
{
return optional($this->mydate)->format('Y-m-d\TH:i');
}
public function setMydateBrAttribute($value)
{
$this->mydate = Carbon::parse($value)->format('Y-m-d H:i:s');
}
}
In the component I added the field in rules:
<?php
namespace App\Http\Livewire;
use App\Models\Models\Platform;
use Livewire\Component;
class PlatformForm extends Component
{
public Platform $platform;
protected $listeners = ['recordToEdit' => 'editPlatform', 'newRecord' => 'createPlatform'];
protected $rules = [
'platform.id' => 'sometimes',
'platform.name' => 'sometimes',
'platform.created_at' => 'sometimes',
'platform.updated_at' => 'sometimes',
'platform.mydate_br' => 'sometimes',
];
public function mount() {
$this->platform = $this->makeBlankPlatform();
}
public function makeBlankPlatform()
{
return Platform::make();
}
public function editPlatform(Platform $platform)
{
$this->platform = $platform;
}
public function createPlatform()
{
$this->platform = new Platform();
$this->platform->created_at = now();
}
public function save()
{
$this->platform->id
? $this->platform->updated_at = now()
: $this->platform->updated_at = $this->platform->created_at;
$this->platform->save();
$this->emit('refresh');
}
public function render()
{
return view('livewire.platform-form');
}
}
And in the view I added the wire:model, like this:
<div>
<div class="form-group">
<label for="name">Name</label>
<input wire:model.defer="platform.name" type="text" class="form-control">
</div>
<div class="form-group">
<label for="mydate_br">My date</label>
<input id="mydate_br" wire:model.defer="platform.mydate_br" type="text" class="form-control">
</div>
<div class="form-group">
<label for="created_at">Created at</label>
<input id="created_at" wire:model="platform.created_at_br" type="text" class="form-control" readonly>
</div>
<div class="form-group">
<label for="updated_at">Updated at</label>
<input id="updated_at" wire:model="platform.updated_at_br" type="text" class="form-control" readonly>
</div>
<hr class="border">
<div class="text-right">
<button type="button" class="btn btn-secondary" data-dismiss="modal">
Cancelar
</button>
<button wire:click="save" type="button" class="btn btn-primary" data-dismiss="modal">
Gravar
</button>
</div>
</div>
The problem is that the date stored in the database is not displayed in the input text, however, if I do it in the standard blade way, {{ $platform->mydate_br }}, the value is displayed, but here I lose functionality of livewire binding.
Anyone have a tip to help me resolve this?