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function render_block_core_post_comments_form( $attributes, $content, $block ) {
	if ( ! isset( $block->context['postId'] ) ) {
		return '';
	}

	if ( post_password_required( $block->context['postId'] ) ) {
		return;
	}

	$classes = array( 'comment-respond' ); // See comment further below.
	if ( isset( $attributes['textAlign'] ) ) {
		$classes[] = 'has-text-align-' . $attributes['textAlign'];
	}
	if ( isset( $attributes['style']['elements']['link']['color']['text'] ) ) {
		$classes[] = 'has-link-color';
	}
	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => implode( ' ', $classes ) ) );

	add_filter( 'comment_form_defaults', 'post_comments_form_block_form_defaults' );

	ob_start();
	comment_form( array(), $block->context['postId'] );
	$form = ob_get_clean();

	remove_filter( 'comment_form_defaults', 'post_comments_form_block_form_defaults' );

	// We use the outermost wrapping `<div />` returned by `comment_form()`
	// which is identified by its default classname `comment-respond` to inject
	// our wrapper attributes. This way, it is guaranteed that all styling applied
	// to the block is carried along when the comment form is moved to the location
	// of the 'Reply' link that the user clicked by Core's `comment-reply.js` script.
	$form = str_replace( 'class="comment-respond"', $wrapper_attributes, $form );

	// Enqueue the comment-reply script.
	wp_enqueue_script( 'comment-reply' );

	return $form;
}