BUG - Group creates a new group entry upon edit & save (MB Blocks extension)

Hi Peter,

We coded the block, I have added below the code of a test block that you can use to troubleshoot and test this bug, We reverted our Meta Box AIO plugin version to 1.30.0 and we do not get have the bug in this version. I suspect the bug is related to the plugin update with 1.30.1 - 2024-09-07 Fix issue with clone_empty_start, that woudl probably be a great place to start the investigation.

Appreciate you looking in to this, let me how if you need any thing else.

Cheers,
Anthony

meta-boxes__test-block.php

<div><?php
add_filter( 'rwmb_meta_boxes', 'test_block_meta_boxes' );
function test_block_meta_boxes( $meta_boxes ) {
  $meta_boxes[] = [
    'title'           => 'Test Block',
    'id'              => "test-block",
    'type'            => 'block',
    'fields' => [
      [
        'type' => 'heading',
        'name' => 'Test Block',
      ],
      [
        'id' => "block_group",
        'type' => 'group',
        'clone' => true,
        'max_clone' => 3,
        'sort_clone' => true,
        'collapsible' => true,
        'save_state' => true,
        'group_title' => 'Group {#}',
        'add_button' => '+ Add Group',
        'fields' => [
          [
            'name' => 'Header',  
            'id'   => "block_header",
            'type' => 'textarea',
            'rows' => 1
          ],
          [
            'id' => "block_group_inner",
            'type' => 'group',
            'clone' => true,
            'sort_clone' => true,
            'collapsible' => true,
            'save_state' => true,
            'group_title' => 'Column {#}',
            'add_button' => '+ Add Test',
            'fields' => [
              [
                'name' => 'Inner Header',  
                'id'   => "block_inner_header",
                'type' => 'textarea',
                'rows' => 1
              ]
            ]
          ],
        ],
      ],
    ],  
  ];
  return $meta_boxes;
};</div>

block.json

<div>{
  "$schema": "https://schemas.wp.org/trunk/block.json",
  "apiVersion": 3,
  "name": "meta-box/test-block",
  "title": "Test Block",
  "description": "The Test Block is a custom block that allows you to test the block editor.",
  "category": "common",
  "icon": "fas fa-truck-monster",
  "keywords": [
    "test",
    "block",
    "test block"
  ],
  "supports": {
    "anchor":true
  },
  "attributes": {
    "anchor":{
      "type": "string"
    },
    "g-block_group": {
      "type": "array"
    }
  },
  "render": "file:./test-block.php"
}</div>

.

text-block.php

<div><?php
/**
 * @var array<string, mixed>[] $attributes The block attributes.
 * @var string $content The block default content.
 * @var \WP_Block $block The block instance.
 */

$blockName = "test_block";
$prefix = "block_";
$class = "mb-block_" . $blockName;
$id = ( $blockName . '-' . $attributes['id'] ?? '' );
if ( ! empty( $attributes['anchor'] ) ) {
	$id = $attributes['anchor'];
}

if( is_admin() || (defined( 'REST_REQUEST' ) && REST_REQUEST && 'edit' === $_GET['context'])) {
	echo '<p>Test Block</p>';
}

$group = $attributes["{$prefix}group"] ?? null;
if( !empty($group)){ 
	var_dump($group);
	foreach ( $group as $group_value ) {  
		$header = isset( $group_value["{$prefix}header"] ) ? $group_value["{$prefix}header"] : null;
		$group_inner = isset( $group_value["{$prefix}group_inner"] ) ? $group_value["{$prefix}group_inner"] : null;
		?>
		<div id="<?php echo $id; ?>" class="<?php echo $class ?> bg--blue">
		<div class="container-fluid--small">
			<div class="row">
				<div class="col-12">
					<?php if($header): ?>
						<h2><?php echo $header; ?></h2>
					<?php endif; ?>
					<?php if( !empty($group_inner)){ 
						foreach ( $group_inner as $group_value ) {  	
							$inner_header = isset( $group_value["{$prefix}inner_header"] ) ? $group_value["{$prefix}inner_header"] : null;
							?>
							<div class="col-12">
								<p><?php echo $inner_header; ?></p>
							</div>
						<?php } ?>
					<?php } ?>
				</div>
			</div>
		</div>
	</div>
<?php }
}</div>