diff --git a/vllm_ascend/platform.py b/vllm_ascend/platform.py
index 0034a65375e..4efa197247a 100644
--- a/vllm_ascend/platform.py
+++ b/vllm_ascend/platform.py
@@ -224,17 +224,9 @@ def inference_mode(cls):
 
     @classmethod
     def update_block_size_for_backend(cls, vllm_config: VllmConfig) -> None:
-        cache_config = vllm_config.cache_config
-        if cache_config.user_specified_block_size:
-            # User specified --block-size; keep it.
-            return
-        model_config = vllm_config.model_config
-        if model_config is not None and model_config.is_hybrid:
-            # Hybrid attention+mamba models rely on the model-specific sizing
-            # logic rather than the generic platform default.
-            return
-
-        super().update_block_size_for_backend(vllm_config)
+        # TODO: NPU still sets block_size in check_and_update_config.
+        # Move that logic here so block_size is chosen by the backend.
+        pass
 
     @classmethod
     def set_device(cls, device: torch.device):
diff --git a/vllm_ascend/utils.py b/vllm_ascend/utils.py
index 4db163c7e0b..8a1ff2202d2 100644
--- a/vllm_ascend/utils.py
+++ b/vllm_ascend/utils.py
@@ -1097,12 +1097,12 @@ def refresh_block_size(vllm_config):
     if not scheduler_config or not model_config:
         return
 
-    # TODO(MengqingCao): Remove the model_type check, after resolving the hidden error in get_kv_cache_groups.
-    if (
-        "qwen3_next" not in model_config.hf_text_config.model_type
-        and "qwen3_5" not in model_config.hf_text_config.model_type
-        and cache_config.block_size != 128
-    ):
+    if model_config.is_hybrid:
+        # Hybrid attention+mamba models rely on the model-specific sizing
+        # logic rather than the generic platform default.
+        return
+
+    if cache_config.block_size != 128:
         if cache_config.enable_prefix_caching or scheduler_config.enable_chunked_prefill:
             logger.info("Block size is set to 128 if prefix cache or chunked prefill is enabled.")
             cache_config.block_size = 128