Inner blocks serialization bug in serialize_block function

[saqibsarwar]

Hi,

The serialize_block function ​https://developer.wordpress.org/reference/functions/serialize_block/ fails when the number of inner blocks increases.

The following custom function solved it for me.

<?php
function custom_serialize_block( $block ) {
        $block_content = '';

        foreach ( $block['innerContent'] as $chunk ) {
                if ( is_string( $chunk ) ) {
                        $block_content .= $chunk;
                } else {
                        foreach ( $block['innerBlocks'] as $inner_block ) {
                                $block_content .= custom_serialize_block( $inner_block );
                        }
                }
        }

        if ( ! is_array( $block['attrs'] ) ) {
                $block['attrs'] = [];
        }

        return get_comment_delimited_block_content(
                $block['blockName'],
                $block['attrs'],
                $block_content
        );
}