Laravel - SQLSTATE[42000]: Syntax error or access violation: 1067 Invalid default value - eloquent

Question

I'm creating a migration with 2 timestamps, but for some reason I can't put 2 timestamps without a default/nullable value.
My code:
Schema::create('lessons', function (Blueprint $table) {
$table->id();
$table->timestamp('checkin');
$table->timestamp('checkout');
$table->string('url')->nullable();
$table->timestamp('created_at')->default(DB::raw('CURRENT_TIMESTAMP'));
$table->timestamp('updated_at')->default(DB::raw('CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP'));
$table->softDeletes();
});
If I put a nullable value in checkout: $table->timestamp('checkout')->nullable; my code working fine. But my two values cannot be empty.
The error:
Illuminate\Database\QueryException
SQLSTATE[42000]: Syntax error or access violation: 1067 Invalid default value for 'checkout' (SQL: create table `lessons` (`id` bigint unsigned not null auto_increment primary key, `checkin` timestamp not null, `checkout` timestamp not null, `url` varchar(191) null, `created_at` timestamp not null default CURRENT_TIMESTAMP, `updated_at` timestamp not null default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP, `deleted_at` timestamp null) default character set utf8mb4 collate 'utf8mb4_unicode_ci')
If a change the order the bug happen the same to checkin
SQLSTATE[42000]: Syntax error or access violation: 1067 Invalid default value for 'checkin' (SQL: create table `lessons` (`id` bigint unsigned not null auto_increment primary key, `checkout` timestamp not null, `checkin` timestamp not null, `url` varchar(191) null, `created_at` timestamp not null default CURRENT_TIMESTAMP, `updated_at` timestamp not null default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP, `deleted_at` timestamp null) default character set utf8mb4 collate 'utf8mb4_unicode_ci')
I think that's can be a bug in Laravel.
Note 1: If I remove the 'second' timestamp not nullable that's work fine.
Note 2: I'm using php artisan migration:fresh to get those results.

Answer 1

I solved my question with this post:
https://stackoverflow.com/a/59326426/11639058
I've change the timestamp to dateTime.