diff --git a/src/PropertyProcessor/ComposedValue/AbstractComposedValueProcessor.php b/src/PropertyProcessor/ComposedValue/AbstractComposedValueProcessor.php
index 13bade1..9d9bbb2 100644
--- a/src/PropertyProcessor/ComposedValue/AbstractComposedValueProcessor.php
+++ b/src/PropertyProcessor/ComposedValue/AbstractComposedValueProcessor.php
@@ -5,6 +5,7 @@
 namespace PHPModelGenerator\PropertyProcessor\ComposedValue;
 
 use PHPModelGenerator\Exception\SchemaException;
+use PHPModelGenerator\Model\MethodInterface;
 use PHPModelGenerator\Model\Property\CompositionPropertyDecorator;
 use PHPModelGenerator\Model\Property\Property;
 use PHPModelGenerator\Model\Property\PropertyInterface;
@@ -117,6 +118,10 @@ function () use (&$resolvedCompositions, $property, $compositionProperties, $pro
             ),
             100
         );
+
+        if (!$this->schema->hasMethod('_getModifiedValues')) {
+            $this->addGetModifiedValuesMethodToSchema($compositionProperties);
+        }
     }
 
     /**
@@ -339,6 +344,64 @@ function () use ($property, $mergedPropertySchema): void {
         }
     }
 
+    /**
+     * Add a method to the schema to gather values from a nested object which are modified. This is required to adopt
+     * filter changes to the values which are passed into a merged property
+     *
+     * @param CompositionPropertyDecorator[] $compositionProperties
+     */
+    private function addGetModifiedValuesMethodToSchema(array $compositionProperties): void
+    {
+        $this->schema->addMethod('_getModifiedValues', new class ($compositionProperties) implements MethodInterface {
+            /** @var CompositionPropertyDecorator[] $compositionProperties */
+            private $compositionProperties;
+
+            public function __construct(array $compositionProperties)
+            {
+                $this->compositionProperties = $compositionProperties;
+            }
+
+            public function getCode(): string
+            {
+                $defaultValueMap = [];
+                $propertyAccessors = [];
+                foreach ($this->compositionProperties as $compositionProperty) {
+                    if (!$compositionProperty->getNestedSchema()) {
+                        continue;
+                    }
+
+                    foreach ($compositionProperty->getNestedSchema()->getProperties() as $property) {
+                        $propertyAccessors[$property->getName()] = 'get' . ucfirst($property->getAttribute());
+
+                        if ($property->getDefaultValue() !== null) {
+                            $defaultValueMap[] = $property->getName();
+                        }
+                    }
+                }
+
+                return sprintf('
+                    private function _getModifiedValues(array $originalModelData, object $nestedCompositionObject): array {
+                        $modifiedValues = [];
+                        $defaultValueMap = %s;
+
+                        foreach (%s as $key => $accessor) {
+                            if ((isset($originalModelData[$key]) || in_array($key, $defaultValueMap))
+                                && method_exists($nestedCompositionObject, $accessor)
+                                && ($modifiedValue = $nestedCompositionObject->$accessor()) !== ($originalModelData[$key] ?? !$modifiedValue)
+                            ) {
+                                $modifiedValues[$key] = $modifiedValue;
+                            }
+                        }
+
+                        return $modifiedValues;
+                    }',
+                    var_export($defaultValueMap, true),
+                    var_export($propertyAccessors, true)
+                );
+            }
+        });
+    }
+
     /**
      * @param int $composedElements The amount of elements which are composed together
      *
diff --git a/src/Templates/Model.phptpl b/src/Templates/Model.phptpl
index 8b77391..dc0e1b1 100644
--- a/src/Templates/Model.phptpl
+++ b/src/Templates/Model.phptpl
@@ -20,7 +20,7 @@ declare(strict_types = 1);
 {% if schema.getDescription() %} * {{ schema.getDescription() }}
  *{% endif %}
  * This is an auto-implemented class implemented by the php-json-schema-model-generator.
- * If you need to implement something in this class use inheritance. Else you will loose your changes if the classes
+ * If you need to implement something in this class use inheritance. Else you will lose your changes if the classes
  * are re-generated.
  */
 class {{ class }} {% if schema.getInterfaces() %}implements {{ viewHelper.joinClassNames(schema.getInterfaces()) }}{% endif %}
diff --git a/src/Templates/Validator/ComposedItem.phptpl b/src/Templates/Validator/ComposedItem.phptpl
index 04c1cee..ba424b2 100644
--- a/src/Templates/Validator/ComposedItem.phptpl
+++ b/src/Templates/Validator/ComposedItem.phptpl
@@ -12,6 +12,7 @@
     $validatorComponentIndex = 0;
     $originalModelData = $value;
     $proposedValue = null;
+    $modifiedValues = [];
 
     {% if not generatorConfiguration.isImmutable() %}
         $originalPropertyValidationState = $this->_propertyValidationState ?? [];
@@ -90,6 +91,9 @@
                     $proposedValue = $proposedValue ?? $value;
                 {% endif %}
 
+                if (is_object($value)) {
+                    $modifiedValues = array_merge($modifiedValues, $this->_getModifiedValues($originalModelData, $value));
+                }
             {% if not generatorConfiguration.isImmutable() %}
                 {% if not generatorConfiguration.collectErrors() %}
                     if (isset($validatorIndex)) {
@@ -118,6 +122,10 @@
 
     {% if mergedProperty %}
         if (is_object($proposedValue)) {
+            if ($modifiedValues) {
+                $value = array_merge($value, $modifiedValues);
+            }
+
             {{ viewHelper.resolvePropertyDecorator(mergedProperty) }}
         } else {
             $value = $proposedValue;
diff --git a/tests/Issues/Issue/Issue70Test.php b/tests/Issues/Issue/Issue70Test.php
new file mode 100644
index 0000000..714b34b
--- /dev/null
+++ b/tests/Issues/Issue/Issue70Test.php
@@ -0,0 +1,74 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PHPModelGenerator\Tests\Issues\Issue;
+
+use PHPModelGenerator\Filter\TransformingFilterInterface;
+use PHPModelGenerator\Model\GeneratorConfiguration;
+use PHPModelGenerator\Tests\Issues\AbstractIssueTest;
+
+class Issue70Test extends AbstractIssueTest
+{
+    /**
+     * @dataProvider validInputDataProvider
+     */
+    public function testValidInput(string $filter, array $input, $expectedOutput): void
+    {
+        $className = $this->generateClassFromFileTemplate(
+            'filterInCompositionInArray.json',
+            [$filter],
+            (new GeneratorConfiguration())->addFilter($this->getFilter())
+        );
+
+        $object = new $className($input);
+
+        $this->assertCount(1, $object->getItems());
+        $this->assertSame('Hello', $object->getItems()[0]->getTitle());
+        $this->assertSame($expectedOutput, $object->getItems()[0]->getProperty());
+    }
+
+    public function validInputDataProvider(): array
+    {
+        return [
+            'basic filter - default value' => ['trim', ['items' => [['title' => 'Hello']]], 'now'],
+            'basic filter - custom value - not modified' => ['trim', ['items' => [['title' => 'Hello', 'property' => 'later']]], 'later'],
+            'basic filter - custom value - modified' => ['trim', ['items' => [['title' => 'Hello', 'property' => '   later   ']]], 'later'],
+            'basic filter - null' => ['trim', ['items' => [['title' => 'Hello', 'property' => null]]], null],
+            'transforming filter - default value' => ['countChars', ['items' => [['title' => 'Hello']]], 3],
+            'transforming filter - transformed value' => ['countChars', ['items' => [['title' => 'Hello', 'property' => 5]]], 5],
+            'transforming filter - custom value' => ['countChars', ['items' => [['title' => 'Hello', 'property' => 'Hello World']]], 11],
+            'transforming filter - null' => ['countChars', ['items' => [['title' => 'Hello', 'property' => null]]], null],
+        ];
+    }
+
+    public function getFilter(): TransformingFilterInterface
+    {
+        return new class () implements TransformingFilterInterface {
+            public function getAcceptedTypes(): array
+            {
+                return ['string', 'null'];
+            }
+
+            public function getToken(): string
+            {
+                return 'countChars';
+            }
+
+            public function getFilter(): array
+            {
+                return [Issue70Test::class, 'filter'];
+            }
+
+            public function getSerializer(): array
+            {
+                return [Issue70Test::class, 'filter'];
+            }
+        };
+    }
+
+    public static function filter(?string $input): ?int
+    {
+        return $input === null ? null : strlen($input);
+    }
+}
diff --git a/tests/Schema/Issues/70/filterInCompositionInArray.json b/tests/Schema/Issues/70/filterInCompositionInArray.json
new file mode 100644
index 0000000..d22b6cd
--- /dev/null
+++ b/tests/Schema/Issues/70/filterInCompositionInArray.json
@@ -0,0 +1,33 @@
+{
+  "type": "object",
+  "properties": {
+    "items": {
+      "type": "array",
+      "items":{
+        "allOf": [
+          {
+            "type": "object",
+            "properties": {
+              "title": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "title"
+            ]
+          },
+          {
+            "type": "object",
+            "properties": {
+              "property": {
+                "type": "string",
+                "filter": "%s",
+                "default": "now"
+              }
+            }
+          }
+        ]
+      }
+    }
+  }
+}
\ No newline at end of file