Livewire component performs unexpected update

In my teams app I want to halt a user to update a model if another user has updated a model before the user updates his version of the model. For that, I use the column updated_at. So I mount the original timestamp updated_at as $lastUpdatedAt. Then when the user tries to update the post, the script loads the post again and compares the posts $updated_at with $lastUpdateAt. If someone else has been updating the post if they are not the same. To prevent overwriting that user's data I want to redirect with a flash warning and urge the user to try again. Surprisingly I can halt the script with dd() but when I try to redirect the post gets updated. Pubs/Form.php

	<?php

namespace App\Livewire\Pubs;

use App\Models\Pub;
use App\Models\Tag;
use App\Models\Type;
use Auth;
#use Illuminate\Console\View\Components\Alert;
use Livewire\Component;
use Illuminate\Contracts\View\View;
use Illuminate\Validation\Rule;
use Jantinnerezo\LivewireAlert\LivewireAlert;
class Form extends Component
{
    use LivewireAlert;
    public ?Pub $pub = null;
    public string $name = '';
    public ?int $type_id;
    public bool $editing = false;
    public array $tags = [];
    public $vat = false;
    public string $gender = '';
    public array $listsForFields = [];
    public string $lastUpdatedAt = ''; // To prevent updating collisions

    public function mount(Pub $pub): void
    {
        $this->initListsForFields();
        if (! is_null($this->pub)) {
            $this->pub = $pub;
            $this->editing = true;
            $this->name = $this->pub->name;
            $this->type_id = $this->pub->type_id;
            $this->tags = $this->pub->tags()->pluck('tags.id')->toArray();
            $this->vat = $this->pub->vat;
            $this->gender = $this->pub->gender;
            $this->lastUpdatedAt = $this->pub->updated_at;
        }
    }

    public function save(): void // Methods are called Actions. They do things, like after a form submit that has wire:submit
    {
        $this->validate();
        if (is_null($this->pub)) {
            $this->pub = Pub::create(
                array_merge($this->only('name', 'type_id', 'vat', 'gender'),  [
                    'team_id' => Auth::user()->team_id,
                    'cb' => Auth::id(),
                    'ub' => Auth::id(),
                    'ua' => now()
                ])
            );
            $msg_str = 'created';
        } else {
            if($this->pub->team_id !== Auth::user()->team_id){ // Some thong fishy is going on, halt script
                abort(404);
            }
            // Redirect if another user in the team has updated the post
            $pub_old = Pub::findOrFail($this->pub->id);
            if(date('Y-m-d H:i:s', strtotime($pub_old->updated_at)) !== (date('Y-m-d H:i:s', strtotime($this->lastUpdatedAt)))){
                #dd('stop');  // WORKS!!
                $this->flash('warning', 'Post could not be updated because someone else has been updated it simultaneously, please try again');
                $this->redirect('/pubs'); // DOESN'T WORK
            }
            $this->pub->update(
                array_merge($this->only('name', 'type_id', 'vat', 'gender'), [
                    'team_id' => Auth::user()->team_id,
                    'ub' => Auth::id()
                ]) // Add team_id on update just to be sure no one has been posting a malicious team_id
            );
            $msg_str = 'updated';
        }
        $this->pub->tags()->sync($this->tags);
        $this->flash('success', 'Post successfully ' . $msg_str);
        $this->redirect('/pubs');
    }

    public function render(): View
    {
        return view('livewire.pubs.form');
    }

    protected function rules(): array
    {
        return [
            'name' => ['required', 'string'],
            'type_id' => ['required', 'integer', 'exists:types,id'],
            'tags' => ['required', 'array'],
            'vat' => ['bool'],
            'gender' => ['required', Rule::in(['male', 'female'])],
        ];
    }

    protected function initListsForFields(): void
    {
        $this->listsForFields['types'] = Type::pluck('name', 'id')->toArray();
        $this->listsForFields['tags'] = Tag::pluck('name', 'id')->toArray();
    }
}