Making my block variation default not working

Hi there,

I am creating a block variation and I’m following this tutorial (https://fullsiteediting.com/lessons/block-variations/). It works, but when I want to make the variation the default one it doesn’t work.

I am using this code:

wp.blocks.registerBlockVariation(
	'core/group',
	{
		name: 'full-width-group',
		title: 'Full width group',
		attributes: {
			align: 'full'
		},
		isDefault: true
	}
);

Adding

isDefault: true

doesn’t work at all. I am missing something?

Thanks!