I’m customizing my Astra child theme to only show certain blocks in the Gutenberg editor, and so I’ve added the following code to my functions.php file:

add_filter( 'allowed_block_types', 'liznov_allowed_block_types' );
function liznov_allowed_block_types( $allowed_blocks ) {
 
	return array(
		'core/paragraph',
		'core/heading',
		'core/image',
		'core/list',
		'core/quote',
		'core/separator',
		'core/spacer',
		'core/audio',
		'core/video',
		'core/file',
		'core/table',
		'core/nextpage',
		'core/verse',
		'core/code',
		'core/freeform',
		'core/html',
		'core/preformatted',
		'core/buttons',
		'core/shortcode',
		'core/text-columns',
		'core/missing'
	);
}

After doing so, however, I lost the option to group blocks or add them to a reusable block. I’ve been googling how I can enable them again, but came up empty. Anybody knows how to fix this?