HasManyLocal: apply getInstance() method for also created records

Author: sngrl

src/Form/Related/Forms/HasManyLocal.php

@@ -445,7 +445,11 @@ protected function createGroup($attributes, $old = false, $key = null): Group
         }
         $model = $attributes instanceof Model
             ? $attributes
-            : $this->safeCreateModel($this->getModelClassForElements(), $attributes);
+            : (
+            null != ($instanceModel = $this->getInstance())
+                ? $this->safeFillModel(clone $instanceModel, $attributes)
+                : $this->safeCreateModel($this->getModelClassForElements(), $attributes)
+            );
         $group = new Group($model);
 
         if ($this->groupLabel) {