Block pattern do not show in the inserter

Hello,
since the update to version 5.8, this simple pattern is no longer displayed in the inserter.

	register_block_pattern(
		"mywpsite/test",
		[
			"title"         => esc_html__("Test"),
			"categories"    => ["mywpsite-default"],
			"content"       => trim(str_replace(["\n", "\r", "\t"], "", '
			<!-- wp:columns --><div class="wp-block-columns">
			<!-- wp:column --><div class="wp-block-column">

			<!-- wp:heading -->
			<h2>Hello world</h2>
			<!-- /wp:heading -->

			</div><!-- /wp:column -->
			</div><!-- /wp:columns -->
			')),
		]
	);

Whenever I remove the column, the pattern is shown up.

Can anyone help me?