Learned that I should not refer to env vars directly so I removed all references.

app/Factory/RecurrenceFactory.php

@@ -44,7 +44,7 @@ class RecurrenceFactory
      */
     public function __construct()
     {
-        if ('testing' === env('APP_ENV')) {
+        if ('testing' === config('app.env')) {
             Log::warning(sprintf('%s should not be instantiated in the TEST environment!', \get_class($this)));
         }
     }