Unsync issue retrieving media immediately after toMediaCollection() in v9

[LufoX11]

Hi. I'm not sure it's something it was alredy fixed in a later version but I'm facing this issue in v9 (I can't upgrade to v10 due to PHP < 8):

 98             $user->addMediaFromBase64(...)->usingName(...)->usingFileName(...)->toMediaCollection(...);
 99             $source = $user->getFirstMediaUrl(...);
100             dd($source); // ""

If I reload $user or add $user->load('media') after toMediaCollection() then it works as expected.

Am I doing something wrong?