Helper class for ACF and Gutenberg. Get blocks fields by passing block_id or block name and post_id, outside the block.

block-helper.php

<?php

class BlockHelper
{
    public function getBlockFromPageByName(string $block_name, int $post_id)
    {
        $post = get_post($post_id);

        if (!$post) return false;
        $blocks = parse_blocks($post->post_content);

        if ($blocks) {
            foreach ($blocks as $block) {
                if($block['blockName'] == $block_name) {

                    acf_setup_meta($block['attrs']['data'], $block['attrs']['id'], true);
                    $acf_fields=get_fields();
                    acf_reset_meta($block['attrs']['id']);

                    return $acf_fields;
                }
            }
        }

        return false;
    }

    //block id example : block_acf-block_6862ace8efff7
    public function getBlockFromPageById(string $block_id, int $post_id)
    {
        $post = get_post($post_id);

        if (!$post) return false;

        $blocks = parse_blocks($post->post_content);

        foreach($blocks as $block){
            if ($block['attrs']['id'] !== $block_id) continue;

            acf_setup_meta($block['attrs']['data'], $block['attrs']['id'], true);
            $acf_fields=get_fields();
            acf_reset_meta($block['attrs']['id']);

            return $acf_fields;
        }

        return false;
    }
}

Use:

<?php
 $helper = new BlockHelper();
 return $helper->getBlockFromPageByName($block_type, $post->ID);
 //return $helper->getBlockFromPageById('block_acf-block_6862abe8e85f7', $post->ID);