Plugin: Meta Box AIO (current version, with MBBlocks\Loader::prepare_render_callback_data).
Last known working version: Meta Box AIO 1.23.1.
Stack: WordPress + WooCommerce + WooCommerce Subscriptions, PHP 8.x.
Bug:
When several instances of the same custom MB block are nested inside other MB blocks (a layout structure like meta-box/section > meta-box/row > meta-box/column > meta-box/plan-tab, with 4 different plan-tab instances inside 4 different columns), all rendered plan-tab instances output the data of the FIRST one. The same block at the top level of the post content renders correctly. The bug only triggers when the block is wrapped inside <InnerBlocks /> of a parent MB block.
Block setup (relevant):
Blocks registered via add_filter('rwmb_meta_boxes', ...) with 'type' => 'block', fields, and 'render_template' => dirname(__FILE__) . '/template.php'.
Templates read $attributes['data'] directly. Some also use mb_get_block_field(). Both return the wrong data in the nested case.
Reproduction:
Register section, row, column blocks whose templates output <InnerBlocks />.
Register a child block (e.g. plan-tab) with several text fields.
In a page, add: section > row > 4 × (column > plan-tab), each plan-tab with different field values.
Frontend: all 4 plan-tabs display the data of the first.
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