diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index 82b2379fb2..be266f2268 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -44,7 +44,6 @@ Yii Framework 2 Change Log
 - Bug #16377: Fixed `yii\base\Event:off()` undefined index error when event handler does not match (razvanphp)
 - Bug #16514: Fixed `yii\di\Container::resolveCallableDependencies` to support callable object (wi1dcard)
 - Bug #15889: Fixed override `yii\helpers\Html::setActivePlaceholder` (lesha724)
-- Bug #16552: Added check in `yii\db\ActiveQuery::prepare()` to prevent populating already populated relation when another relation is requested with `via` (drlibra)
 - Enh #16522: Allow jQuery 3.3 (Slamdunk)
 - Enh #16603: Added `yii\mutex\FileMutex::$isWindows` for Windows file shares on Unix guest machines (brandonkelly)
 - Bug #16666: Fixed `yii\helpers\ArrayHelper::merge` (rustamwin)
diff --git a/framework/assets/yii.validation.js b/framework/assets/yii.validation.js
index 7809b6f9fa..16a74f03ca 100644
--- a/framework/assets/yii.validation.js
+++ b/framework/assets/yii.validation.js
@@ -238,9 +238,7 @@ yii.validation = (function ($) {
 
         trim: function ($form, attribute, options, value) {
             var $input = $form.find(attribute.input);
-            var isCheckAble = $input.find('[type=radio]').is('[type=radio]') || $input.find('[type=checkbox]').is('[type=checkbox]');
-
-            if (!isCheckAble) {
+            if ($input.is(':checkbox, :radio')) {
                 return value;
             }
 
diff --git a/framework/db/ActiveQuery.php b/framework/db/ActiveQuery.php
index 5af019e441..46086fbbab 100644
--- a/framework/db/ActiveQuery.php
+++ b/framework/db/ActiveQuery.php
@@ -172,19 +172,11 @@ class ActiveQuery extends Query implements ActiveQueryInterface
                 /* @var $viaQuery ActiveQuery */
                 list($viaName, $viaQuery) = $this->via;
                 if ($viaQuery->multiple) {
-                    if ($this->primaryModel->isRelationPopulated($viaName)) {
-                        $viaModels = $this->primaryModel->$viaName;
-                    } else {
-                        $viaModels = $viaQuery->all();
-                        $this->primaryModel->populateRelation($viaName, $viaModels);
-                    }
+                    $viaModels = $viaQuery->all();
+                    $this->primaryModel->populateRelation($viaName, $viaModels);
                 } else {
-                    if ($this->primaryModel->isRelationPopulated($viaName)) {
-                        $model = $this->primaryModel->$viaName;
-                    } else {
-                        $model = $viaQuery->one();
-                        $this->primaryModel->populateRelation($viaName, $model);
-                    }
+                    $model = $viaQuery->one();
+                    $this->primaryModel->populateRelation($viaName, $model);
                     $viaModels = $model === null ? [] : [$model];
                 }
                 $this->filterByModels($viaModels);
diff --git a/framework/di/Container.php b/framework/di/Container.php
index 4a31a34540..34c804373c 100644
--- a/framework/di/Container.php
+++ b/framework/di/Container.php
@@ -523,7 +523,7 @@ class Container extends Component
     {
         if (is_array($callback)) {
             $reflection = new \ReflectionMethod($callback[0], $callback[1]);
-        } elseif (is_object($callback)) {
+        } elseif (is_object($callback) && !$callback instanceof \Closure) {
             $reflection = new \ReflectionMethod($callback, '__invoke');
         } else {
             $reflection = new \ReflectionFunction($callback);
diff --git a/tests/js/tests/yii.validation.test.js b/tests/js/tests/yii.validation.test.js
index 70402c400e..65fa1b3a30 100644
--- a/tests/js/tests/yii.validation.test.js
+++ b/tests/js/tests/yii.validation.test.js
@@ -1214,6 +1214,9 @@ describe('yii.validation', function () {
         var $input = {
             val: function () {
                 return getInputVal();
+            },
+            is: function () {
+                return false;
             }
         };
         var $form = {
@@ -1274,6 +1277,32 @@ describe('yii.validation', function () {
         });
     });
 
+    describe('trim filter on checkbox', function () {
+        var attribute = {input: '#input-id'};
+        var getInputVal;
+        var $checkbox = {
+            is: function (selector) {
+                if (selector === ':checked') {
+                    return true;
+                }
+
+                if (selector === ':checkbox, :radio') {
+                    return true;
+                }
+            }
+        };
+        var $form = {
+            find: function () {
+                return $checkbox;
+            }
+        };
+
+
+        it('should be left as is', function () {
+            assert.strictEqual(yii.validation.trim($form, attribute, {}, true), true);
+        });
+    });
+
     describe('captcha validator', function () {
         // Converted using yii\captcha\CaptchaAction generateValidationHash() method
         var hashes = {'Code': 379, 'code': 411};