Outputting Data from Cloneable Groups In Custom MB-Blocks

I created a custom Block (the Fields) with the Builder and the Template in a separate PHP document.
Inserting the Block in a Page works and the Static Code like Div's and other HTML-Tags are displayed correctly, so its configured correctly in the 'Field Group'/Block Settings.

Since all my custom field's are inside a clonable Group in that Block, i dont really understand how I receive the data.

I tried the 2 helper functions mb_the_block_field(''), and mb_get_block_field(''), but as far as i understood the MB Blocks extension description, these only output non-grouped fields.
For Groups i need to use:

$alternating_block_values = rwmb_meta( 'alternating-block_group' );
if ( ! empty( $alternating_block_values ) ) {
    foreach (  $alternating_block_values as $alternating_block ) {
        $value = isset( $alternating_block[$sub_field_key] ) ? $alternating_block[$sub_field_key] : '';
        echo $value; // Display sub-field value
    }
}

because it separates the Values in the Array it catches from the Database.

But Blocks arent saving their Data in the Database.
And thus works only outside Blocks, also not catching the Data for the current Block like the Helper functions would.

Now i dont really know how to output the correct Data for a clone inside of a Custom MB-Block.

<hr />

Further Informations:

My Fields:

• alternating-block_group = [group]
• alternating-block_top-heading = [Text]
• alternating-block_sub-heading = [Text]
• alternating-block_textarea = [WYSIWYG Editor]
• alternating-block_image = [Single Image]
• alternating-block_image-handling = [Button Group]
• alternating-block_image-position = [Button Group]

Example of my Code for the Subheading and Text:

<div>
  <h3>
    <?php mb_the_block_field('alternating-block_sub-heading'); ?>
  </h3>
  <p>
    <?php mb_the_block_field('alternating-block_textarea'); ?>
  </p>
</div>