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Your setup worked!
But I could not do the same using the MB Builder that is on my site.

I ran a test, reinstalling a clean version of my site locally and this time I was able to use the clonable groups using the builder.

So there is no problem with your component. Thank you very much for the help, and congratulations again.

Hello!

I tried to register using MB Builder, but here is the code that I put in the MB Template to test otherwise.

title: Prazos
fields:
  - name: Group
    id: grop_name
    type: group
    fields:
      - name: Group, 
        id: group_1, 
        type: group,
        fields: 
        - {name: test, id: test, type: text}
        - {name: test1, id: test1, type: text2}
        - {name: test2, id: test2, type: text2}