WordPress 6.0 Example: Allowing a block patter to be show as a suggestion on new Pages.

wp-6-0-suggested-block-pattern.php

<?php
/**
 * Example showing how to allow a block pattern to be shown as a suggested pattern for new Pages.
 */
add_action(
	'init',
	function() {
		register_block_pattern(
			'block-pattern-suggestion-example',
			array(
				'title'      => __( 'Example Block Pattern to be shown on new Pages', 'pattern-suggestion-example' ),
				'categories' => array( 'pages' ),
				'blockTypes' => array('core/post-content'), // Add this line to allow this pattern to be shown as a pattern suggestion.
				'content'    => '
						<!-- wp:paragraph {"fontSize":"small"} -->
						<p class="has-small-font-size">Example Content</p>
						<!-- /wp:paragraph -->',
			)
		);
	}
);