[xurshudyan]

When a factory with has() or hasAttached() is reused, recycle() changes the shared relationship object instead of a copy, so the recycled models stick around for every later call:

$users = User::factory()->has(Post::factory()->count(3));

$users->recycle($teamA)->create();
$users->recycle($teamB)->create(); // posts randomly get team A or team B
$users->create();                  // posts still get team A or team B

This makes recycle() on the relationship return a copy, like everything else on the factory does.