Fixed problem in StdDelegatingSerializer#serializeWithType where final serializer lookup was done on the pre-converted value when _delegateSerializer was null. (#4749)

Author: k163377

release-notes/CREDITS-2.x

@@ -1840,3 +1840,7 @@ Rikkarth (rikkarth@github)
 Maxim Valeev (@MaximValeev)
  * Reported #4508: Deserialized JsonAnySetter field in Kotlin data class is null
   (2.18.1)
+
+wrongwrong (@k163377)
+ * Contributed #4749: Fixed problem in StdDelegatingSerializer#serializeWithType where final serializer lookup was done
+   on the pre-converted value when _delegateSerializer was null

release-notes/VERSION-2.x

@@ -6,6 +6,9 @@ Project: jackson-databind
 
 2.18.1 (WIP-2024)
 
+#4749: Fixed a problem with `StdDelegatingSerializer#serializeWithType` looking up the serializer
+  with the wrong argument
+ (fix by wrongwrong)
 #4508: Deserialized JsonAnySetter field in Kotlin data class is null
  (reported by @MaximValeev)
  (fix by Joo-Hyuk K)

src/main/java/com/fasterxml/jackson/databind/ser/std/StdDelegatingSerializer.java

@@ -181,7 +181,7 @@ public void serializeWithType(Object value, JsonGenerator gen, SerializerProvide
         }
         JsonSerializer<Object> ser = _delegateSerializer;
         if (ser == null) {
-            ser = _findSerializer(value, provider);
+            ser = _findSerializer(delegateValue, provider);
         }
         ser.serializeWithType(delegateValue, gen, provider, typeSer);
     }