diff --git a/python/PyQt6/core/auto_generated/processing/qgsprocessingcontext.sip.in b/python/PyQt6/core/auto_generated/processing/qgsprocessingcontext.sip.in
index 99c99c858917..3058f23c53cf 100644
--- a/python/PyQt6/core/auto_generated/processing/qgsprocessingcontext.sip.in
+++ b/python/PyQt6/core/auto_generated/processing/qgsprocessingcontext.sip.in
@@ -662,6 +662,13 @@ Returns the model results, populated when the context is used to run a model alg
 %End
 
 
+    void clearModelResult();
+%Docstring
+Clears model results previously populated when the context was used to run a model algorithm.
+
+.. versionadded:: 3.42
+%End
+
   private:
     QgsProcessingContext( const QgsProcessingContext &other );
 };
diff --git a/python/core/auto_generated/processing/qgsprocessingcontext.sip.in b/python/core/auto_generated/processing/qgsprocessingcontext.sip.in
index b35acb194587..f049c6216b8e 100644
--- a/python/core/auto_generated/processing/qgsprocessingcontext.sip.in
+++ b/python/core/auto_generated/processing/qgsprocessingcontext.sip.in
@@ -662,6 +662,13 @@ Returns the model results, populated when the context is used to run a model alg
 %End
 
 
+    void clearModelResult();
+%Docstring
+Clears model results previously populated when the context was used to run a model algorithm.
+
+.. versionadded:: 3.42
+%End
+
   private:
     QgsProcessingContext( const QgsProcessingContext &other );
 };
diff --git a/python/plugins/processing/gui/AlgorithmExecutor.py b/python/plugins/processing/gui/AlgorithmExecutor.py
index c1ef9432d449..8c7fadc022d3 100644
--- a/python/plugins/processing/gui/AlgorithmExecutor.py
+++ b/python/plugins/processing/gui/AlgorithmExecutor.py
@@ -465,6 +465,9 @@ def executeIterating(alg, parameters, paramToIter, context, feedback):
         if feedback.isCanceled():
             return False
 
+        # clear any model result stored in the last iteration
+        context.clearModelResult()
+
         parameters[paramToIter] = f
         for out in alg.destinationParameterDefinitions():
             if out.name() not in outputs:
diff --git a/src/core/processing/models/qgsprocessingmodelalgorithm.cpp b/src/core/processing/models/qgsprocessingmodelalgorithm.cpp
index 17825726dc88..3e9fe7da2e93 100644
--- a/src/core/processing/models/qgsprocessingmodelalgorithm.cpp
+++ b/src/core/processing/models/qgsprocessingmodelalgorithm.cpp
@@ -373,7 +373,9 @@ QVariantMap QgsProcessingModelAlgorithm::processAlgorithm( const QVariantMap &pa
         break;
 
       if ( executed.contains( childId ) )
+      {
         continue;
+      }
 
       bool canExecute = true;
       const QSet< QString > dependencies = dependsOnChildAlgorithms( childId );
@@ -387,7 +389,9 @@ QVariantMap QgsProcessingModelAlgorithm::processAlgorithm( const QVariantMap &pa
       }
 
       if ( !canExecute )
+      {
         continue;
+      }
 
       executedAlg = true;
 
diff --git a/src/core/processing/qgsprocessingcontext.cpp b/src/core/processing/qgsprocessingcontext.cpp
index 3feb9876fced..f22bde0030a1 100644
--- a/src/core/processing/qgsprocessingcontext.cpp
+++ b/src/core/processing/qgsprocessingcontext.cpp
@@ -325,3 +325,8 @@ std::unique_ptr< QgsProcessingModelInitialRunConfig > QgsProcessingContext::take
 {
   return std::move( mModelConfig );
 }
+
+void QgsProcessingContext::clearModelResult()
+{
+  mModelResult.clear();
+}
diff --git a/src/core/processing/qgsprocessingcontext.h b/src/core/processing/qgsprocessingcontext.h
index 33beda889663..2cc3c7cd3554 100644
--- a/src/core/processing/qgsprocessingcontext.h
+++ b/src/core/processing/qgsprocessingcontext.h
@@ -794,6 +794,13 @@ class CORE_EXPORT QgsProcessingContext
      */
     QgsProcessingModelResult &modelResult() SIP_SKIP { return mModelResult; }
 
+    /**
+     * Clears model results previously populated when the context was used to run a model algorithm.
+     *
+     * \since QGIS 3.42
+     */
+    void clearModelResult();
+
   private:
 
     QgsProcessingContext::Flags mFlags = QgsProcessingContext::Flags();
diff --git a/tests/src/analysis/testqgsprocessing.cpp b/tests/src/analysis/testqgsprocessing.cpp
index 4d72b1f2d96f..39839d721f92 100644
--- a/tests/src/analysis/testqgsprocessing.cpp
+++ b/tests/src/analysis/testqgsprocessing.cpp
@@ -1412,6 +1412,21 @@ void TestQgsProcessing::context()
   QCOMPARE( context3.modelResult().childResults().value( QStringLiteral( "CHILD1" ) ).outputs().value( QStringLiteral( "RESULT1" ) ).toInt(), 1 );
   QCOMPARE( context3.modelResult().childResults().value( QStringLiteral( "CHILD2" ) ).outputs().value( QStringLiteral( "RESULT2" ) ).toInt(), 2 );
 
+  QgsProcessingContext context4;
+  context4.takeResultsFrom( context );
+  context4.modelResult().rawChildInputs().insert( QStringLiteral( "test_input" ), 1 );
+  context4.modelResult().rawChildOutputs().insert( QStringLiteral( "test_output" ), 1 );
+  context4.modelResult().executedChildIds() << "alg:test";
+  QCOMPARE( context4.modelResult().childResults().count(), 2 );
+  QCOMPARE( context4.modelResult().rawChildInputs().count(), 1 );
+  QCOMPARE( context4.modelResult().rawChildOutputs().count(), 1 );
+  QCOMPARE( context4.modelResult().executedChildIds().count(), 1 );
+  context4.clearModelResult();
+  QCOMPARE( context4.modelResult().childResults().count(), 0 );
+  QCOMPARE( context4.modelResult().rawChildInputs().count(), 0 );
+  QCOMPARE( context4.modelResult().rawChildOutputs().count(), 0 );
+  QCOMPARE( context4.modelResult().executedChildIds().count(), 0 );
+
   // make sure postprocessor is correctly deleted
   ppDeleted = false;
   pp = new TestPostProcessor( &ppDeleted );