Hi Donald,
adjusting the code like this should work:
$img_block_counter = 0; foreach ( $blocks as $block ) { if ( 'core/image' === $block['blockName'] && $img_block_counter === 0 ) { $img_block_counter++; continue; } else { $content_markup .= render_block( $block ); } }
Hope that helps!
Florian