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
}
);