Fixed `yii\db\BaseActiveRecord::refresh()` may set incorrect `oldAttributes` values at some cases

framework/CHANGELOG.md

@@ -7,6 +7,7 @@ Yii Framework 2 Change Log
 - Enh #9989: ActiveForm now respects formtarget, formmethod and formenctype attributes of submit button (AnatolyRugalev)
 - Enh #12296: Added value validation to `yii\log\Target::setLevels()` (Mak-Di)
 - Enh #12073: Added the ability to suppress the generation of input hint when it is specified through  `Model::attributeHints()` (PowerGamer1)
+- Bug #11990: Fixed `yii\db\BaseActiveRecord::refresh()` may set incorrect `oldAttributes` values at some cases (only-victor)
 - Bug #12009: Do not render "for" field label attribute for active form RadioList and CheckboxList (shevchik87, samdark)
 - Bug #12068: Added missing 'LEVEL_PROFILE' for the syslog target (Mak-Di)
 - Bug #11461: Fixed migration tool error when create migrate with comma in defaultValue (pana1990, s-o-f)

framework/db/BaseActiveRecord.php

@@ -973,7 +973,7 @@ abstract class BaseActiveRecord extends Model implements ActiveRecordInterface
         foreach ($this->attributes() as $name) {
             $this->_attributes[$name] = isset($record->_attributes[$name]) ? $record->_attributes[$name] : null;
         }
-        $this->_oldAttributes = $this->_attributes;
+        $this->_oldAttributes = $record->_oldAttributes;
         $this->_related = [];
         $this->afterRefresh();