Somehow getting forum posts from a completely unrelelated forum channel

export async function fetch_all_threads_archive_count(forum: Discord.ForumChannel, count: number) {
    const threads = new Discord.Collection([
        ...await fetch_active_threads(forum),
        ...await fetch_inactive_threads_count(forum, count)
    ]);
    return threads;
}

            // ... 
            const threads = await fetch_all_threads_archive_count(forum, cleanup_limit);
            M.debug("Cleaning up", threads.size, "threads in", forum.name);
            for(const [ _, thread ] of threads) {
                M.debug(thread.name, thread.parentId, forum.id, forum.name);
                assert(thread.parentId && thread.parentId == forum.id);
                ...
            }

export async function fetch_active_threads(forum: Discord.ForumChannel) {
    const { threads } = await forum.threads.fetchActive();
    return threads;
}

export async function fetch_inactive_threads_count(forum: Discord.ForumChannel, count: number) {
    let before: string | undefined = undefined;
    const thread_entries: [string, Discord.ThreadChannel][] = [];
    while(true) {
        const { threads, hasMore } = await forum.threads.fetchArchived({ before, limit: Math.min(count, 100) });
        thread_entries.push(...threads);
        // The type annotation is needed because of a typescript bug
        // https://github.com/microsoft/TypeScript/issues/51115
        const last: Discord.ThreadChannel = threads.last()!;
        before = last.id;
        count -= threads.size;
        if(!hasMore || count <= 0) {
            break;
        }
    }
    return new Discord.Collection(thread_entries);
}