Issue with short codes cat/cats

In source of plugin you just check for cat, not cats as arg. So cats=’foo,bar’ fails but cat=’foo’ or cat=’foo,bar’ works.

// Category
		if ( $atts['cat'] ) {
			if ( strpos( $atts['cat'], "," ) !== false ) {
				$atts['cats'] = explode( ",", $atts['cat'] );
				$atts['cats'] = array_map( 'trim', $atts['cats'] );
			} else {
				$atts['cats'] = $atts['cat'];
			}

https://www.ads-software.com/plugins/the-events-calendar/