トレイリングスラッシュ

https://ja.wordpress.org/support/topic/トレイリングスラッシュが自動で消されてしまう/#post-11687432

https://www.tenman.info/wp-37/2024/02/wp-block-group-vertical

grid note

https://www.tenman.info/wp-37/2024/03/grid-note

add_filter( 'render_block_core/embed', 'test_embed', 10, 2 );

function test_embed($block_content, $block){

	$correct= trailingslashit($block['attrs']['url']);
	return str_replace($block['attrs']['url'],$correct,$block_content);

}