Issue #3384216: bugs in code of MaestrEngine::setProcessVariable

src/Engine/MaestroEngine.php

@@ -406,7 +406,7 @@ class MaestroEngine {
       // now we determine if there's any production assignments done on this variable
       // by_variable = 1, process_variable needs to match our variable.
       $query = \Drupal::entityTypeManager()->getStorage('maestro_production_assignments')->getQuery();
-      $query ->condition('process_variable', $varID)
+      $query ->condition('process_variable', $varID, 'IN')
         ->accessCheck(FALSE)
         ->condition('by_variable', '1')
         ->condition('task_completed', '0');