BUG: load blocks closed by default?

I am using the following bit of code to collapse all the block categories, unfortunately, this is not working

const categories = editor.BlockManager.getCategories();
categories.each(category => {
	category.set('open', false).on('change:open', opened => {
		opened.get('open') && categories.each(category => {
            category !== opened && category.set('open', false)
        })
	})
})

live demo : https://jsfiddle.net/d4702yoh/2/

What is wrong here?

[artf]

That should be enough editor.Blocks.getCategories().forEach(ct => ct.set('open', false)) but categories are not created until the render of blocks (which happens, by default, when you click the Blocks tab) so you just need to execute that script once are rendered.

[throne1986]

Thanks your right