Ticket #46900: 46900.2.diff

wp-admin/includes/class-wp-site-health.php

@@ -457 +457 @@
                         $allowed_theme_count++;
                 }
 
-                // If there's a default theme installed, we count that as allowed as well.
-                if ( $has_default_theme ) {
+                // If there's a default theme installed and not in use, we count that as allowed as well.
+                if ( $has_default_theme && ! $using_default_theme ) {
                         $allowed_theme_count++;
                 }