Automated rollback of commit caf1ce3b35.

PiperOrigin-RevId: 542601832

java/core/src/main/java/com/google/protobuf/GeneratedMessageLite.java

@@ -1432,7 +1432,6 @@ public abstract class GeneratedMessageLite<
 
     // since v3.6.1
     private final Class<?> messageClass;
-    // only included for backwards compatibility before messageClass was added
     private final String messageClassName;
     private final byte[] asBytes;
 
@@ -1443,7 +1442,7 @@ public abstract class GeneratedMessageLite<
      */
     SerializedForm(MessageLite regularForm) {
       messageClass = regularForm.getClass();
-      messageClassName = messageClass.getName();
+      messageClassName = regularForm.getClass().getName();
       asBytes = regularForm.toByteArray();
     }