$blocks = parse_blocks( get_the_content() );
foreach ( $blocks as $block ) {
if ( 'test/test' === $block['blockName'] ) {
echo do_shortcode( $block['innerHTML'] );
break;
}
}

the test / test block is not displayed.

print_r($blocks) :
[...]
Array ( [blockName] => test/test [attrs] => Array ( ) [innerBlocks] => Array ( ) [innerHTML] => [innerContent] => Array ( ) ) )