diff --git a/src/UI/Implementation/Component/Input/Field/Checkbox.php b/src/UI/Implementation/Component/Input/Field/Checkbox.php
index 32cba0be0840..55a899950db0 100644
--- a/src/UI/Implementation/Component/Input/Field/Checkbox.php
+++ b/src/UI/Implementation/Component/Input/Field/Checkbox.php
@@ -51,7 +51,7 @@ protected function getConstraintForRequirement(): ?Constraint
     /**
      * @inheritdoc
      */
-    public function isClientSideValueOk($value): bool
+    protected function isClientSideValueOk($value): bool
     {
         if ($value == "checked" || $value === "" || is_bool($value)) {
             return true;
diff --git a/src/UI/Implementation/Component/Input/Field/DateTime.php b/src/UI/Implementation/Component/Input/Field/DateTime.php
index 4123dcb58e9f..291ff7c97d3f 100644
--- a/src/UI/Implementation/Component/Input/Field/DateTime.php
+++ b/src/UI/Implementation/Component/Input/Field/DateTime.php
@@ -174,7 +174,7 @@ public function getTimeOnly(): bool
         return $this->with_time_only;
     }
 
-    public function isClientSideValueOk($value): bool
+    protected function isClientSideValueOk($value): bool
     {
         return is_string($value);
     }
diff --git a/src/UI/Implementation/Component/Input/Field/Duration.php b/src/UI/Implementation/Component/Input/Field/Duration.php
index c63afaf02c2f..170dc08183da 100644
--- a/src/UI/Implementation/Component/Input/Field/Duration.php
+++ b/src/UI/Implementation/Component/Input/Field/Duration.php
@@ -276,7 +276,7 @@ public function getTimezone(): ?string
     /**
      * @inheritdoc
      */
-    public function isClientSideValueOk($value): bool
+    protected function isClientSideValueOk($value): bool
     {
         return true;
     }
diff --git a/src/UI/Implementation/Component/Input/Field/File.php b/src/UI/Implementation/Component/Input/Field/File.php
index b5ca9f9dc9db..67870472b297 100644
--- a/src/UI/Implementation/Component/Input/Field/File.php
+++ b/src/UI/Implementation/Component/Input/Field/File.php
@@ -195,7 +195,7 @@ function ($txt, $value) {
         );
     }
 
-    public function isClientSideValueOk($value): bool
+    protected function isClientSideValueOk($value): bool
     {
         if (!is_array($value)) {
             return false;
diff --git a/src/UI/Implementation/Component/Input/Field/Group.php b/src/UI/Implementation/Component/Input/Field/Group.php
index dc0f7cb4a6ed..01ad9482f660 100644
--- a/src/UI/Implementation/Component/Input/Field/Group.php
+++ b/src/UI/Implementation/Component/Input/Field/Group.php
@@ -154,4 +154,10 @@ protected function getDataFactory(): DataFactory
     {
         return $this->data_factory;
     }
+
+    /** ATTENTION: @see GroupInternals::_isClientSideValueOk() */
+    protected function isClientSideValueOk($value): bool
+    {
+        return $this->_isClientSideValueOk($value);
+    }
 }
diff --git a/src/UI/Implementation/Component/Input/Field/Hidden.php b/src/UI/Implementation/Component/Input/Field/Hidden.php
index ed95cd026e6b..2a0b4316d5da 100644
--- a/src/UI/Implementation/Component/Input/Field/Hidden.php
+++ b/src/UI/Implementation/Component/Input/Field/Hidden.php
@@ -46,7 +46,7 @@ protected function getConstraintForRequirement(): ?Constraint
         return null;
     }
 
-    public function isClientSideValueOk($value): bool
+    protected function isClientSideValueOk($value): bool
     {
         return true;
     }
diff --git a/src/UI/Implementation/Component/Input/Field/Link.php b/src/UI/Implementation/Component/Input/Field/Link.php
index 1f3d62848ec1..207a5d9068c5 100644
--- a/src/UI/Implementation/Component/Input/Field/Link.php
+++ b/src/UI/Implementation/Component/Input/Field/Link.php
@@ -85,7 +85,7 @@ protected function addTransformation(): void
     /**
      * @inheritdoc
      */
-    public function isClientSideValueOk($value): bool
+    protected function isClientSideValueOk($value): bool
     {
         return true;
     }
diff --git a/src/UI/Implementation/Component/Input/Field/MultiSelect.php b/src/UI/Implementation/Component/Input/Field/MultiSelect.php
index 018a9d77d1ef..531fd32761af 100644
--- a/src/UI/Implementation/Component/Input/Field/MultiSelect.php
+++ b/src/UI/Implementation/Component/Input/Field/MultiSelect.php
@@ -61,7 +61,7 @@ public function getOptions(): array
     /**
      * @inheritdoc
      */
-    public function isClientSideValueOk($value): bool
+    protected function isClientSideValueOk($value): bool
     {
         if (is_null($value)) {
             return true;
diff --git a/src/UI/Implementation/Component/Input/Field/Numeric.php b/src/UI/Implementation/Component/Input/Field/Numeric.php
index d65479726886..5075bada2a24 100644
--- a/src/UI/Implementation/Component/Input/Field/Numeric.php
+++ b/src/UI/Implementation/Component/Input/Field/Numeric.php
@@ -57,7 +57,7 @@ public function __construct(
     /**
      * @inheritdoc
      */
-    public function isClientSideValueOk($value): bool
+    protected function isClientSideValueOk($value): bool
     {
         return is_numeric($value) || $value === "" || $value === null;
     }
diff --git a/src/UI/Implementation/Component/Input/Field/OptionalGroup.php b/src/UI/Implementation/Component/Input/Field/OptionalGroup.php
index 1760cda1c7b6..d34a7121367e 100644
--- a/src/UI/Implementation/Component/Input/Field/OptionalGroup.php
+++ b/src/UI/Implementation/Component/Input/Field/OptionalGroup.php
@@ -51,7 +51,7 @@ protected function getConstraintForRequirement(): ?Constraint
     /**
      * @inheritdoc
      */
-    public function isClientSideValueOk($value): bool
+    protected function isClientSideValueOk($value): bool
     {
         if ($value === null) {
             return true;
diff --git a/src/UI/Implementation/Component/Input/Field/Password.php b/src/UI/Implementation/Component/Input/Field/Password.php
index aed9289de75b..41d9fb6dae59 100644
--- a/src/UI/Implementation/Component/Input/Field/Password.php
+++ b/src/UI/Implementation/Component/Input/Field/Password.php
@@ -61,7 +61,7 @@ public function __construct(
     /**
      * @inheritdoc
      */
-    public function isClientSideValueOk($value): bool
+    protected function isClientSideValueOk($value): bool
     {
         return is_string($value);
     }
diff --git a/src/UI/Implementation/Component/Input/Field/Radio.php b/src/UI/Implementation/Component/Input/Field/Radio.php
index 813917dbe4ad..c29d46f8beb9 100644
--- a/src/UI/Implementation/Component/Input/Field/Radio.php
+++ b/src/UI/Implementation/Component/Input/Field/Radio.php
@@ -49,7 +49,7 @@ class Radio extends FormInput implements C\Input\Field\Radio
     /**
      * @inheritdoc
      */
-    public function isClientSideValueOk($value): bool
+    protected function isClientSideValueOk($value): bool
     {
         return ($value === '' || array_key_exists($value, $this->getOptions()));
     }
diff --git a/src/UI/Implementation/Component/Input/Field/Select.php b/src/UI/Implementation/Component/Input/Field/Select.php
index 990f1859c835..6ad40cde7527 100644
--- a/src/UI/Implementation/Component/Input/Field/Select.php
+++ b/src/UI/Implementation/Component/Input/Field/Select.php
@@ -61,7 +61,7 @@ public function getOptions(): array
     /**
      * @inheritdoc
      */
-    public function isClientSideValueOk($value): bool
+    protected function isClientSideValueOk($value): bool
     {
         return in_array($value, array_keys($this->options)) || $value == "";
     }
diff --git a/src/UI/Implementation/Component/Input/Field/SwitchableGroup.php b/src/UI/Implementation/Component/Input/Field/SwitchableGroup.php
index d3fd342329b6..75d8e2f029a7 100644
--- a/src/UI/Implementation/Component/Input/Field/SwitchableGroup.php
+++ b/src/UI/Implementation/Component/Input/Field/SwitchableGroup.php
@@ -68,7 +68,7 @@ protected function getConstraintForRequirement(): ?Constraint
     /**
      * @inheritdoc
      */
-    public function isClientSideValueOk($value): bool
+    protected function isClientSideValueOk($value): bool
     {
         if (!is_string($value) && !is_int($value)) {
             return false;
diff --git a/src/UI/Implementation/Component/Input/Field/Tag.php b/src/UI/Implementation/Component/Input/Field/Tag.php
index 5421500b7693..5773e2e67cba 100644
--- a/src/UI/Implementation/Component/Input/Field/Tag.php
+++ b/src/UI/Implementation/Component/Input/Field/Tag.php
@@ -132,7 +132,7 @@ protected function getConstraintForRequirement(): ?Constraint
     /**
      * @inheritDoc
      */
-    public function isClientSideValueOk($value): bool
+    protected function isClientSideValueOk($value): bool
     {
         if ($this->getMaxTags() > 0) {
             $max_tags = $this->getMaxTags();
diff --git a/src/UI/Implementation/Component/Input/Field/Text.php b/src/UI/Implementation/Component/Input/Field/Text.php
index 48e89d85ba47..cad63383e034 100644
--- a/src/UI/Implementation/Component/Input/Field/Text.php
+++ b/src/UI/Implementation/Component/Input/Field/Text.php
@@ -70,7 +70,7 @@ public function getMaxLength(): ?int
     /**
      * @inheritdoc
      */
-    public function isClientSideValueOk($value): bool
+    protected function isClientSideValueOk($value): bool
     {
         if (!is_string($value)) {
             return false;
diff --git a/src/UI/Implementation/Component/Input/Field/Textarea.php b/src/UI/Implementation/Component/Input/Field/Textarea.php
index 0de1bf78f4bd..e78802b580b8 100644
--- a/src/UI/Implementation/Component/Input/Field/Textarea.php
+++ b/src/UI/Implementation/Component/Input/Field/Textarea.php
@@ -103,7 +103,7 @@ public function getMinLimit(): ?int
     /**
      * @inheritdoc
      */
-    public function isClientSideValueOk($value): bool
+    protected function isClientSideValueOk($value): bool
     {
         return is_string($value);
     }
diff --git a/src/UI/Implementation/Component/Input/Field/Url.php b/src/UI/Implementation/Component/Input/Field/Url.php
index f5d53abcb584..e6a66d300215 100644
--- a/src/UI/Implementation/Component/Input/Field/Url.php
+++ b/src/UI/Implementation/Component/Input/Field/Url.php
@@ -97,7 +97,7 @@ public static function getURIChecker(): Closure
     /**
      * @inheritdoc
      */
-    public function isClientSideValueOk($value): bool
+    protected function isClientSideValueOk($value): bool
     {
         if (is_string($value) && trim($value) === "") {
             return true;
diff --git a/src/UI/Implementation/Component/Input/Group.php b/src/UI/Implementation/Component/Input/Group.php
index d0b650b49e42..4697ca20efbf 100644
--- a/src/UI/Implementation/Component/Input/Group.php
+++ b/src/UI/Implementation/Component/Input/Group.php
@@ -121,9 +121,11 @@ protected function nameInputs(NameSource $source, string $parent_name): array
     }
 
     /**
-     * @inheritdoc
+     * ATTENTION: This is not the same as @see Input::isClientSideValueOk,
+     * even if it had the same name. These are different symbols, as this trait
+     * is not in the hierarchy that defines the original isClientSideValueOk.
      */
-    public function isClientSideValueOk($value): bool
+    protected function _isClientSideValueOk($value): bool
     {
         if (!is_array($value)) {
             return false;
diff --git a/src/UI/Implementation/Component/Input/Input.php b/src/UI/Implementation/Component/Input/Input.php
index 53d1fdfb05b0..93b489b19dfd 100644
--- a/src/UI/Implementation/Component/Input/Input.php
+++ b/src/UI/Implementation/Component/Input/Input.php
@@ -116,7 +116,7 @@ public function withValue($value): self
      *
      * @param mixed $value
      */
-    abstract public function isClientSideValueOk($value): bool;
+    abstract protected function isClientSideValueOk($value): bool;
 
     /**
      * The error of the input as used in HTML.
diff --git a/src/UI/Implementation/Component/Input/ViewControl/FieldSelection.php b/src/UI/Implementation/Component/Input/ViewControl/FieldSelection.php
index 5ba225879339..0c017a6ad746 100644
--- a/src/UI/Implementation/Component/Input/ViewControl/FieldSelection.php
+++ b/src/UI/Implementation/Component/Input/ViewControl/FieldSelection.php
@@ -45,7 +45,7 @@ public function __construct(
         $this->internal_selection_signal = $signal_generator->create();
     }
 
-    public function isClientSideValueOk($value): bool
+    protected function isClientSideValueOk($value): bool
     {
         return is_null($value) || is_array($value);
     }
diff --git a/src/UI/Implementation/Component/Input/ViewControl/Group.php b/src/UI/Implementation/Component/Input/ViewControl/Group.php
index e941f804d14b..1e659793a0cd 100644
--- a/src/UI/Implementation/Component/Input/ViewControl/Group.php
+++ b/src/UI/Implementation/Component/Input/ViewControl/Group.php
@@ -98,4 +98,10 @@ protected function getDataFactory(): DataFactory
     {
         return $this->data_factory;
     }
+
+    /** ATTENTION: @see GroupInternals::_isClientSideValueOk() */
+    protected function isClientSideValueOk($value): bool
+    {
+        return $this->_isClientSideValueOk($value);
+    }
 }
diff --git a/src/UI/Implementation/Component/Input/ViewControl/GroupDecorator.php b/src/UI/Implementation/Component/Input/ViewControl/GroupDecorator.php
index c534c4dc1a93..7d73870aa72e 100644
--- a/src/UI/Implementation/Component/Input/ViewControl/GroupDecorator.php
+++ b/src/UI/Implementation/Component/Input/ViewControl/GroupDecorator.php
@@ -92,7 +92,7 @@ public function getContent(): Result
     /**
      * @inheritDoc
      */
-    public function isClientSideValueOk($value): bool
+    protected function isClientSideValueOk($value): bool
     {
         return $this->input_group->isClientSideValueOk($value);
     }