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WC Lancaster filter to show block type if you have WP_DEBUG turned on.
add_filter( 'render_block', 'wplancpa_2019_show_block_type', 10, 2 );
function wplancpa_2019_show_block_type( $block_content, $block ) {
if ( true === WP_DEBUG ) {
$block_content = "<h5 style=\"color:salmon\">{$block['blockName']}</h5><div class='wp-block' data-blockType='{$block['blockName']}'>{$block_content}</div>";
return $block_content;
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