diff --git a/CHANGELOG.asciidoc b/CHANGELOG.asciidoc
index f3bbafa6463..b0f02d733ab 100644
--- a/CHANGELOG.asciidoc
+++ b/CHANGELOG.asciidoc
@@ -27,6 +27,8 @@ image::https://raw.githubusercontent.com/apache/tinkerpop/master/docs/static/ima
 
 This release also includes changes from prior 3.7.x releases.
 
+* Fixed `AddPropertyStep` not passing the old property to `EventStrategy` listeners when the cardinality was not specified in `property()`.
+
 [[release-3-8-2]]
 === TinkerPop 3.8.2 (Release Date: September 1, 2026)
 
diff --git a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/sideEffect/AddPropertyStep.java b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/sideEffect/AddPropertyStep.java
index 4223f98bd5c..691c11ad9f1 100644
--- a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/sideEffect/AddPropertyStep.java
+++ b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/sideEffect/AddPropertyStep.java
@@ -104,6 +104,10 @@ protected void sideEffect(final Traverser.Admin<S> traverser) {
                     "Property cardinality can only be set for a Vertex but the traversal encountered %s for key: %s",
                     element.getClass().getSimpleName(), key));
 
+        final VertexProperty.Cardinality effectiveCardinality = this.cardinality != null
+                ? this.cardinality
+                : element.graph().features().vertex().getCardinality(key);
+
         final Optional<EventStrategy> optEventStrategy = getTraversal().getStrategies().getStrategy(EventStrategy.class);
         final boolean eventingIsConfigured = EventUtil.hasAnyCallbacks(callbackRegistry)
                 && optEventStrategy.isPresent();
@@ -111,17 +115,13 @@ protected void sideEffect(final Traverser.Admin<S> traverser) {
 
         // find property to remove. only need to capture the removedProperty if eventing is configured
         final Property removedProperty = eventingIsConfigured ?
-                captureRemovedProperty(element, key, value, es) :
+                captureRemovedProperty(element, key, value, effectiveCardinality, es) :
                 VertexProperty.empty();
 
-        final VertexProperty.Cardinality card = this.cardinality != null
-                ? this.cardinality
-                : element.graph().features().vertex().getCardinality(key);
-
         // update property
         if (element instanceof Vertex) {
-            if (null != card) {
-                ((Vertex) element).property(card, key, value, vertexPropertyKeyValues);
+            if (null != effectiveCardinality) {
+                ((Vertex) element).property(effectiveCardinality, key, value, vertexPropertyKeyValues);
             } else if (vertexPropertyKeyValues.length > 0) {
                 ((Vertex) element).property(key, value, vertexPropertyKeyValues);
             } else {
@@ -140,11 +140,12 @@ protected void sideEffect(final Traverser.Admin<S> traverser) {
     }
 
     private Property captureRemovedProperty(final Element element, final String key, final Object value,
+                                            final VertexProperty.Cardinality effectiveCardinality,
                                             final EventStrategy es){
         Property removedProperty = VertexProperty.empty();
 
         if (element instanceof Vertex) {
-            if (cardinality == VertexProperty.Cardinality.set) {
+            if (effectiveCardinality == VertexProperty.Cardinality.set) {
                 final Iterator<? extends Property> properties = element.properties(key);
                 while (properties.hasNext()) {
                     final Property property = properties.next();
@@ -153,7 +154,7 @@ private Property captureRemovedProperty(final Element element, final String key,
                         break;
                     }
                 }
-            } else if (cardinality == VertexProperty.Cardinality.single) {
+            } else if (effectiveCardinality == VertexProperty.Cardinality.single) {
                 removedProperty = element.property(key);
             }
         } else {
diff --git a/gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/decoration/EventStrategyProcessTest.java b/gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/decoration/EventStrategyProcessTest.java
index 0bad3387320..f5367917681 100644
--- a/gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/decoration/EventStrategyProcessTest.java
+++ b/gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/decoration/EventStrategyProcessTest.java
@@ -57,6 +57,7 @@
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.core.IsInstanceOf.instanceOf;
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assume.assumeTrue;
 
 /**
  * @author Stephen Mallette (http://stephen.genoprime.com)
@@ -1051,6 +1052,39 @@ public void vertexPropertyChanged(final Vertex element, final VertexProperty old
         assertThat(triggered.get(), is(true));
     }
 
+    @Test
+    @FeatureRequirementSet(FeatureRequirementSet.Package.VERTICES_ONLY)
+    public void shouldCaptureOldVertexPropertyWhenChangedWithDefaultCardinality() {
+        assumeTrue(graph.features().vertex().getCardinality("to-change") == VertexProperty.Cardinality.single);
+
+        final AtomicBoolean triggered = new AtomicBoolean(false);
+        final Vertex v = graph.addVertex();
+        v.property("to-change", "blah");
+
+        final MutationListener listener = new AbstractMutationListener() {
+            @Override
+            public void vertexPropertyChanged(final Vertex element, final VertexProperty oldValue, final Object setValue, final Object... vertexPropertyKeyValues) {
+                assertEquals("to-change", oldValue.key());
+                assertEquals("blah", oldValue.value());
+                assertEquals("dah", setValue);
+                triggered.set(true);
+            }
+        };
+        final EventStrategy.Builder builder = EventStrategy.build().addListener(listener);
+
+        if (graph.features().graph().supportsTransactions())
+            builder.eventQueue(new EventStrategy.TransactionalEventQueue(graph));
+
+        final EventStrategy eventStrategy = builder.create();
+        final GraphTraversalSource gts = create(eventStrategy);
+
+        gts.V(v).property("to-change", "dah").iterate();
+        tryCommit(graph);
+
+        assertEquals(1, IteratorUtils.count(g.V(v).properties()));
+        assertThat(triggered.get(), is(true));
+    }
+
     @Test
     @FeatureRequirementSet(FeatureRequirementSet.Package.VERTICES_ONLY)
     public void shouldDetachVertexPropertyWhenNew() {