Thread .fetchArchived() doesn't return all the archived threads even if those are public

async execute(interaction) {
    await interaction.deferReply({ ephemeral: true });

    const guild = interaction.guild;
    
    try {
        const inputChannel = await interaction.options.getChannel('channel');
        // Get the active threads
        let channel = await inputChannel.threads.fetch();
        // Get the archived threads
        let archived = await inputChannel.threads.fetchArchived();

        let posts = [];
        
        archived.threads.forEach(async post => {
            posts.push(post);
        })

        console.log(posts.length);
    }
    catch(e) {
        console.log(e);
        await interaction.editReply({content: `Something went wrong while processing the interaction`});
    }
}