Issue #3458783: Ensure the month limit is consistent with the field definition settings

Closes #3458783

modules/smart_date_recur/src/SmartDateRecurTrait.php

@@ -4,6 +4,7 @@ namespace Drupal\smart_date_recur;
 
 use Drupal\Core\StringTranslation\StringTranslationTrait;
 use Drupal\smart_date\SmartDateTrait;
+use Drupal\smart_date_recur\Entity\SmartDateRule;
 
 /**
  * Provides friendly methods for smart date range.
@@ -224,8 +225,12 @@ trait SmartDateRecurTrait {
    * Retrieve the months_limit value from the field definition.
    */
   public function getMonthsLimit($field_def) {
-    $month_limit = $this->getThirdPartyFallback($field_def, 'month_limit', 12);
-    return $month_limit;
+    if (($field_def instanceof SmartDateRule) && $parent_entity = $field_def->getParentEntity()) {
+      /** @var \Drupal\Core\Entity\FieldableEntityInterface $parent_entity */
+      $field_name = $field_def->get('field_name')->value;
+      $field_def = $parent_entity->getFieldDefinition($field_name);
+    }
+    return $this->getThirdPartyFallback($field_def, 'month_limit', 12);
   }
 
   /**