/**
 * Remove squared button style
 *
 * @since Twenty Twenty 1.0
 */
/* global wp */
wp.domReady( function() {
	wp.blocks.unregisterBlockStyle( 'core/button', 'squared' );
} );
<b>x<br><br>Windows NT KPTV 6.2 build 9200 (Windows Server 2012 Datacenter Edition) i586<br></b>