Cascading afterCreatingState() in factories

I'm creating a forum which has these relationships:

ForumCategory hasmany ForumThread hasmany ForumReply

and both ForumThread and FormReply hasmany ForumLike

I'm now trying to set up factories and seeders and I'm using the afterCreatingState() to create relationship models:

ForumCategoryFactory:

$factory->define(ForumCategory::class, function (Faker $faker) {
    return [

        'name' => implode(' ', $this->faker->words(3)),
        'description' => $this->faker->text(600),

    ];
});


$factory->afterCreatingState(ForumCategory::class, 'with-threads', function ($category) {

    $category->forumThreads()
    ->saveMany(factory(ForumThread::class, rand(0,6))
    ->states('with-user','with-replies','with-likes')
    ->create());
});

ForumThreadFactory:

$factory->define(ForumThread::class, function (Faker $faker) {

    return [
        'title' => implode(' ',$faker->words(3)),
        'message' => $faker->text(600),
        'is_resolved' => false,
        'is_locked' => false,
        'is_pinned' => $faker->boolean(),
        'is_live' => true,
        'is_visible' => true,
        'view_count' => $faker->numberBetween(0,1000),
        'user_id' => null,
        'forum_category_id' => null,

    ];
});

$factory->afterCreatingState(ForumThread::class, 'with-replies', function ($thread) {


    $thread->forumReplies()
    ->saveMany(factory(ForumReply::class, rand(0,6))
    ->states('with-user')
    ->create());
});

$factory->afterCreatingState(ForumThread::class, 'with-likes', function ($thread) {

     $thread->forumLikes()
    ->saveMany(factory(ForumLike::class, rand(0,6))
    ->states('with-user')
    ->create());
});

///

ForumReplyFactory:

$factory->define(ForumReply::class, function (Faker $faker) {
    return [
        'message' => $faker->text(600),
        'is_solution' => $faker->boolean(),
        'is_locked' => $faker->boolean(),
        'is_pinned' => $faker->boolean(),
        'is_visible' => true,
        'user_id' => null,
        'forum_thread_id' => null,
    ];
});


$factory->afterCreatingState(ForumReply::class, 'with-likes', function ($reply) {

    $reply->forumLikes()
    ->saveMany(factory(ForumLike::class, rand(0,6))
    ->states('with-user')
    ->make());
});

///

For the most part it is working, the category is created as are threads and replies and likes. The threads have relationships to the category.

The problem I'm having is that the ForumReply and ForumLike models all have null 'forum_thread_id`

Thanks for any guidance or spotting of glaring errors.