En Chrome 77 las metaboxes se quedan flotando en Gutenberg por encima del contenido.

<?php

/**
 * Modify the height of a specific CSS class to fix an issue in Chrome 77 with Gutenberg.
 *
 * @see https://github.com/WordPress/gutenberg/issues/17406
 */
add_action(
	'admin_head',
	function() {
		echo '<style>.block-editor-writing-flow { height: auto; }</style>'; // phpcs:ignore
	}
);