Find model return null in redis queue

Question

I have the following code

$user = new User([]);
$user->save();

event(new TestEvent($user->getKey()));

And in the TestEvent, I tried to get the user model from the key.

Log::info($this->key);
$user = User::find($this->key);

But for the first few times, the user return null even I still get the correct key in log.

I only use 1 DB in my project, and I do not use transaction when save the user

Can anyone help me to explain why this error happen.