diff --git a/tensorrt_llm/executor/proxy.py b/tensorrt_llm/executor/proxy.py
index 11451bad5b67..6118561d534b 100644
--- a/tensorrt_llm/executor/proxy.py
+++ b/tensorrt_llm/executor/proxy.py
@@ -573,7 +573,9 @@ def mpi_done_callback(future: concurrent.futures.Future):
             raise RuntimeError(
                 "Executor worker returned error") from ready_signal
 
-        if isinstance(self.mpi_session, MpiPoolSession) and len(status) == 3:
+        # Use the polymorphic predicate: the module-level ``MpiPoolSession``
+        # symbol may be rebound to a factory at runtime, breaking ``isinstance``.
+        if not self.mpi_session.is_comm_session() and len(status) == 3:
             worker_process_identities: List[WorkerProcessIdentity] = status[2]
             self._worker_process_monitor.register(worker_process_identities)
 
diff --git a/tests/integration/test_lists/waives.txt b/tests/integration/test_lists/waives.txt
index e6fd0e0f0d8b..966a32b3212c 100644
--- a/tests/integration/test_lists/waives.txt
+++ b/tests/integration/test_lists/waives.txt
@@ -448,7 +448,6 @@ unittest/_torch/ray_orchestrator/multi_gpu/test_llm_update_weights_multi_gpu.py
 unittest/_torch/ray_orchestrator/multi_gpu/test_llm_update_weights_multi_gpu.py::test_llm_partial_update_weights_nvfp4[auto-Qwen3/Qwen3-8B] SKIP (https://nvbugs/6372690)
 unittest/_torch/ray_orchestrator/multi_gpu/test_llm_update_weights_multi_gpu.py::test_llm_partial_update_weights_nvfp4[fp8-Qwen3/Qwen3-30B-A3B] SKIP (https://nvbugs/6372690)
 unittest/_torch/ray_orchestrator/multi_gpu/test_llm_update_weights_multi_gpu.py::test_llm_partial_update_weights_nvfp4[fp8-Qwen3/Qwen3-8B] SKIP (https://nvbugs/6372690)
-unittest/_torch/speculative/test_eagle3.py::test_llama_eagle3[True-TRTLLM-True-False-True-True-True-False-False-False] SKIP (https://nvbugs/6451425)
 unittest/_torch/thop/parallel/test_fp8_rowwise_linear.py::test_fp8_rowwise_linear[dtype1] SKIP (https://nvbugs/6301807)
 unittest/_torch/thop/serial/test_moe.py::TestMoeFp4::test_no_autotune[use_score_as_input-RoutingDSv3-swiglu-1024-1024-1] SKIP (https://nvbugs/5908070)
 unittest/_torch/thop/serial/test_moe.py::TestMoeFp4::test_no_autotune[use_score_as_input-RoutingRenormalize_qwen_next-swiglu-1024-1024-150] SKIP (https://nvbugs/5908070)