diff --git a/src/ray/gcs/gcs_ray_event_converter.cc b/src/ray/gcs/gcs_ray_event_converter.cc
index 1eeaa90039b1..2f8e90b4ae98 100644
--- a/src/ray/gcs/gcs_ray_event_converter.cc
+++ b/src/ray/gcs/gcs_ray_event_converter.cc
@@ -141,10 +141,19 @@ rpc::TaskEvents ConvertToTaskEvents(rpc::events::TaskLifecycleEvent &&event) {
   task_event.set_job_id(event.job_id());
 
   rpc::TaskStateUpdate *task_state_update = task_event.mutable_state_updates();
-  task_state_update->set_node_id(event.node_id());
-  task_state_update->set_worker_id(event.worker_id());
-  task_state_update->set_worker_pid(event.worker_pid());
-  *task_state_update->mutable_error_info() = std::move(*event.mutable_ray_error_info());
+  if (!event.node_id().empty()) {
+    task_state_update->set_node_id(event.node_id());
+  }
+  if (!event.worker_id().empty()) {
+    task_state_update->set_worker_id(event.worker_id());
+  }
+  // worker pid can never be 0
+  if (event.worker_pid() != 0) {
+    task_state_update->set_worker_pid(event.worker_pid());
+  }
+  if (event.has_ray_error_info()) {
+    *task_state_update->mutable_error_info() = std::move(*event.mutable_ray_error_info());
+  }
 
   for (const auto &state_transition : event.state_transitions()) {
     int64_t ns = ProtoTimestampToAbslTimeNanos(state_transition.timestamp());
@@ -193,7 +202,9 @@ rpc::TaskEvents ConvertToTaskEvents(rpc::events::TaskProfileEvents &&event) {
   task_event.set_attempt_number(event.attempt_number());
   task_event.set_job_id(event.job_id());
 
-  *task_event.mutable_profile_events() = std::move(*event.mutable_profile_events());
+  if (event.has_profile_events()) {
+    *task_event.mutable_profile_events() = std::move(*event.mutable_profile_events());
+  }
   return task_event;
 }
 
diff --git a/src/ray/gcs/tests/gcs_ray_event_converter_test.cc b/src/ray/gcs/tests/gcs_ray_event_converter_test.cc
index 2656013071ef..454faa6dc91b 100644
--- a/src/ray/gcs/tests/gcs_ray_event_converter_test.cc
+++ b/src/ray/gcs/tests/gcs_ray_event_converter_test.cc
@@ -411,5 +411,139 @@ TEST(GcsRayEventConverterTest, TestConvertActorTaskDefinitionEvent) {
   EXPECT_EQ(task_info.required_resources().at("GPU"), 1.0);
 }
 
+// Parameterized test for optional fields in TaskLifecycleEvent.
+// Tests that optional fields are only set when they have non-empty values,
+// preventing issues where explicitly set empty fields overwrite existing values
+// during protobuf mergeFrom() operations.
+struct OptionalFieldTestCase {
+  std::string test_name;
+  std::string node_id;
+  std::string worker_id;
+  int32_t worker_pid;
+  std::string error_message;  // Empty string means no error_info should be set
+  bool expect_node_id_set;
+  bool expect_worker_id_set;
+  bool expect_worker_pid_set;
+  bool expect_error_info_set;
+};
+
+class TaskLifecycleEventOptionalFieldsTest
+    : public ::testing::TestWithParam<OptionalFieldTestCase> {};
+
+TEST_P(TaskLifecycleEventOptionalFieldsTest, TestOptionalFieldPresence) {
+  const auto &test_case = GetParam();
+
+  rpc::events::AddEventsRequest request;
+  rpc::events::RayEvent &event = *request.mutable_events_data()->mutable_events()->Add();
+  event.set_event_type(rpc::events::RayEvent::TASK_LIFECYCLE_EVENT);
+  rpc::events::TaskLifecycleEvent &lifecycle_event =
+      *event.mutable_task_lifecycle_event();
+
+  // Set basic required fields
+  lifecycle_event.set_task_id("test_task_id");
+  lifecycle_event.set_task_attempt(1);
+  lifecycle_event.set_job_id("test_job_id");
+
+  // Set optional fields according to test case
+  lifecycle_event.set_node_id(test_case.node_id);
+  lifecycle_event.set_worker_id(test_case.worker_id);
+  lifecycle_event.set_worker_pid(test_case.worker_pid);
+
+  // Set error_info if specified
+  if (!test_case.error_message.empty()) {
+    lifecycle_event.mutable_ray_error_info()->set_error_message(test_case.error_message);
+  }
+
+  // Call the converter
+  auto task_event_data_requests = ConvertToTaskEventDataRequests(std::move(request));
+  ASSERT_EQ(task_event_data_requests.size(), 1);
+  const rpc::TaskEvents &task_event =
+      task_event_data_requests[0].data().events_by_task()[0];
+
+  // Verify that state_updates exists
+  ASSERT_TRUE(task_event.has_state_updates());
+  const auto &state_updates = task_event.state_updates();
+
+  // Verify field presence matches expectations
+  EXPECT_EQ(state_updates.has_node_id(), test_case.expect_node_id_set)
+      << "node_id presence mismatch for test: " << test_case.test_name;
+  if (test_case.expect_node_id_set) {
+    EXPECT_EQ(state_updates.node_id(), test_case.node_id);
+  }
+
+  EXPECT_EQ(state_updates.has_worker_id(), test_case.expect_worker_id_set)
+      << "worker_id presence mismatch for test: " << test_case.test_name;
+  if (test_case.expect_worker_id_set) {
+    EXPECT_EQ(state_updates.worker_id(), test_case.worker_id);
+  }
+
+  EXPECT_EQ(state_updates.has_worker_pid(), test_case.expect_worker_pid_set)
+      << "worker_pid presence mismatch for test: " << test_case.test_name;
+  if (test_case.expect_worker_pid_set) {
+    EXPECT_EQ(state_updates.worker_pid(), test_case.worker_pid);
+  }
+
+  EXPECT_EQ(state_updates.has_error_info(), test_case.expect_error_info_set)
+      << "error_info presence mismatch for test: " << test_case.test_name;
+  if (test_case.expect_error_info_set) {
+    EXPECT_EQ(state_updates.error_info().error_message(), test_case.error_message);
+  }
+}
+
+INSTANTIATE_TEST_SUITE_P(
+    OptionalFields,
+    TaskLifecycleEventOptionalFieldsTest,
+    ::testing::Values(
+        // All fields empty - none should be set
+        OptionalFieldTestCase{"AllEmpty", "", "", 0, "", false, false, false, false},
+        // All fields non-empty - all should be set
+        OptionalFieldTestCase{"AllNonEmpty",
+                              "test_node_id",
+                              "test_worker_id",
+                              1234,
+                              "Test error",
+                              true,
+                              true,
+                              true,
+                              true},
+        // Mixed: node_id set, others empty
+        OptionalFieldTestCase{
+            "OnlyNodeId", "test_node_id", "", 0, "", true, false, false, false},
+        // Mixed: worker_id set, others empty
+        OptionalFieldTestCase{
+            "OnlyWorkerId", "", "test_worker_id", 0, "", false, true, false, false},
+        // Mixed: worker_pid set, others empty
+        OptionalFieldTestCase{
+            "OnlyWorkerPid", "", "", 5678, "", false, false, true, false},
+        // Only error_info set, others empty
+        OptionalFieldTestCase{
+            "OnlyErrorInfo", "", "", 0, "Test error", false, false, false, true},
+        // Mixed: node_id and worker_pid set, worker_id and error_info empty
+        OptionalFieldTestCase{
+            "NodeIdAndWorkerPid", "test_node_id", "", 9999, "", true, false, true, false},
+        // Mixed: worker_id and worker_pid set, node_id and error_info empty
+        OptionalFieldTestCase{"WorkerIdAndWorkerPid",
+                              "",
+                              "test_worker_id",
+                              4321,
+                              "",
+                              false,
+                              true,
+                              true,
+                              false},
+        // Mixed: worker_id and error_info set, others empty
+        OptionalFieldTestCase{"WorkerIdAndErrorInfo",
+                              "",
+                              "test_worker_id",
+                              0,
+                              "Worker error",
+                              false,
+                              true,
+                              false,
+                              true}),
+    [](const ::testing::TestParamInfo<OptionalFieldTestCase> &info) {
+      return info.param.test_name;
+    });
+
 }  // namespace gcs
 }  // namespace ray