Issue #1875020: Cron queue gets processed every time cron is called, regardless of whether it's already being processed elsewhere

core/lib/Drupal/Core/Cron.php

@@ -134,6 +134,10 @@ public function run() {
     }
     else {
       $this->invokeCronHandlers();
+
+      // Process cron queues.
+      $this->processQueues();
+
       $this->setCronLastTime();
 
       // Release cron lock.
@@ -143,9 +147,6 @@ public function run() {
       $return = TRUE;
     }
 
-    // Process cron queues.
-    $this->processQueues();
-
     // Restore the user.
     $this->accountSwitcher->switchBack();