Blocks in blocks

Kirby 3 Questions 🤔
1

Hi,

I’m designing a modular one-pager with the new blocks feature.
So I’ve created custom blocks like hero, biography, etc.
I’ve also created one called activity, and I put in this custom block another system of blocks.
Everything works fine, however when I call my blocks in my template, nothing appears.

Here are my codes:

site/templates/home.php

<?php snippet('header') ?>

<?= $site->onepager()->toBlocks() ?>

<?php snippet('footer') ?>

site/snippets/blocks/activity.php

<?= $block->content()->toBlocks() ?>

<!-- This is a test to see if something is loading -->
<?= $block->text()->kt() ?>

site/blueprints/site.yml

title: Site
columns:
  - width: 2/3
    sections:
      onepagerSection:
        type: fields
        fields:
          onepager:
            type: blocks
            fieldsets:
              […]
              activity:
                name: Contenu
                tabs:
                  content:
                    name: Contenu
                    fields:
                      title:
                        label: Titre
                        type: text
                      content:
                        label: Contenu
                        type: blocks

                      # This is a test to see if something is loading
                      text:
                        label: Texte
                        type: textarea

                  settings:
                    […]

You can see that I added a textarea for testing purpose. So my textarea is loading but nothing from my block in block. I can add my content with blocks in the custom block activity, but nothing is visible on the front end.

Did I miss something? or is it something impossible to achieve?

Thanks!