diff --git a/tensorrt_llm/serve/openai_disagg_service.py b/tensorrt_llm/serve/openai_disagg_service.py
index a4c100f6458c..d8870fad0668 100644
--- a/tensorrt_llm/serve/openai_disagg_service.py
+++ b/tensorrt_llm/serve/openai_disagg_service.py
@@ -23,6 +23,7 @@
     MetadataServerConfig,
     ServerRole,
     get_global_disagg_request_id,
+    rewrite_usage_response_from_ctx,
 )
 from tensorrt_llm.logger import logger
 from tensorrt_llm.serve.cluster_storage import ClusterStorage, WatchEventType
@@ -499,4 +500,12 @@ async def _yield_from_queue():
                 )
             )
             responses = await asyncio.gather(*tasks)
-            return responses[-1]
+            gen_response = responses[-1]
+            if need_ctx:
+                # The generation worker treats the whole transferred prompt as
+                # cached, so its usage accounting over-reports cached_tokens.
+                # Adopt the context worker's accounting, mirroring the
+                # context-first path which propagates ctx_usage to the gen
+                # worker (not possible here since both requests run concurrently).
+                rewrite_usage_response_from_ctx(gen_response, responses[0].usage)
+            return gen_response
diff --git a/tests/integration/defs/disaggregated/test_configs/disagg_config_overlap_gen_first.yaml b/tests/integration/defs/disaggregated/test_configs/disagg_config_overlap_gen_first.yaml
index 72a316ad86bc..50e8f172101b 100644
--- a/tests/integration/defs/disaggregated/test_configs/disagg_config_overlap_gen_first.yaml
+++ b/tests/integration/defs/disaggregated/test_configs/disagg_config_overlap_gen_first.yaml
@@ -12,9 +12,9 @@ context_servers:
   tensor_parallel_size: 1
   pipeline_parallel_size: 1
   kv_cache_config:
-    enable_block_reuse: False
+    enable_block_reuse: True
     free_gpu_memory_fraction: 0.2
-    enable_partial_reuse: False
+    enable_partial_reuse: True
 
   cache_transceiver_config:
     backend: DEFAULT
@@ -29,9 +29,9 @@ generation_servers:
   max_num_tokens: 4096
   max_seq_len: 4096
   kv_cache_config:
-    enable_block_reuse: False
+    enable_block_reuse: True
     free_gpu_memory_fraction: 0.2
-    enable_partial_reuse: False
+    enable_partial_reuse: True
   cache_transceiver_config:
     backend: DEFAULT
     transceiver_runtime: PYTHON
diff --git a/tests/integration/defs/disaggregated/test_configs/disagg_config_overlap_gen_first_pp4.yaml b/tests/integration/defs/disaggregated/test_configs/disagg_config_overlap_gen_first_pp4.yaml
index e924722aef1d..4f50e9b57150 100644
--- a/tests/integration/defs/disaggregated/test_configs/disagg_config_overlap_gen_first_pp4.yaml
+++ b/tests/integration/defs/disaggregated/test_configs/disagg_config_overlap_gen_first_pp4.yaml
@@ -12,9 +12,9 @@ context_servers:
   tensor_parallel_size: 1
   pipeline_parallel_size: 4
   kv_cache_config:
-    enable_block_reuse: False
+    enable_block_reuse: True
     free_gpu_memory_fraction: 0.2
-    enable_partial_reuse: False
+    enable_partial_reuse: True
 
   cache_transceiver_config:
     backend: DEFAULT
@@ -29,9 +29,9 @@ generation_servers:
   max_num_tokens: 4096
   max_seq_len: 4096
   kv_cache_config:
-    enable_block_reuse: False
+    enable_block_reuse: True
     free_gpu_memory_fraction: 0.2
-    enable_partial_reuse: False
+    enable_partial_reuse: True
   cache_transceiver_config:
     backend: DEFAULT
     transceiver_runtime: PYTHON
diff --git a/tests/integration/test_lists/waives.txt b/tests/integration/test_lists/waives.txt
index a1fd69684188..ba8cad14c36b 100644
--- a/tests/integration/test_lists/waives.txt
+++ b/tests/integration/test_lists/waives.txt
@@ -178,8 +178,6 @@ disaggregated/test_disaggregated.py::test_disaggregated_deepseek_v3_lite_fp8_tp1
 disaggregated/test_disaggregated.py::test_disaggregated_genbs1[TinyLlama-1.1B-Chat-v1.0] SKIP (https://nvbugs/6162322)
 disaggregated/test_disaggregated.py::test_disaggregated_gpt_oss_120b_harmony[gpt_oss/gpt-oss-120b] SKIP (https://nvbugs/6245317)
 disaggregated/test_disaggregated.py::test_disaggregated_kv_cache_time_output[TinyLlama-1.1B-Chat-v1.0] SKIP (https://nvbugs/6184906)
-disaggregated/test_disaggregated.py::test_disaggregated_overlap_gen_first[ctx_pp1-TinyLlama-1.1B-Chat-v1.0] SKIP (https://nvbugs/6223556)
-disaggregated/test_disaggregated.py::test_disaggregated_overlap_gen_first[ctx_pp4-TinyLlama-1.1B-Chat-v1.0] SKIP (https://nvbugs/6223556)
 disaggregated/test_disaggregated.py::test_disaggregated_single_gpu[TinyLlama-1.1B-Chat-v1.0] SKIP (https://nvbugs/6184906)
 disaggregated/test_disaggregated_single_gpu.py::test_disaggregated_llama_context_capacity[False-False-DeepSeek-V3-Lite-fp8/fp8] SKIP (https://nvbugs/6266302)
 disaggregated/test_workers.py::test_workers_conversation_router[TinyLlama-1.1B-Chat-v1.0] SKIP (https://nvbugs/6162322)