Custom site icon does not appear in the admin bar

v1.5.3

The value of $output in the multisite_enhancements_add_admin_bar_favicon_css filter seems to have been rewritten and the site icon does not appear.

class-add-admin-favicon.php 227

$output = apply_filters( ‘multisite_enhancements_add_admin_bar_favicon_css’, $output );

class-add-site-status-labels.php 45

add_filter( ‘multisite_enhancements_add_admin_bar_favicon_css’, array( $this, ‘status_label_css’ ) );