Fix MTP MoE weight loading with NVFP4 target model. (#10758)

python/sglang/srt/layers/moe/fused_moe_triton/layer.py

@@ -575,7 +575,10 @@ class FusedMoE(torch.nn.Module):
             )
 
         # Flashinfer assumes w31 format for w13_weight. Same for the scales.
-        if should_use_flashinfer_trtllm_moe():
+        if (
+            should_use_flashinfer_trtllm_moe()
+            and self.quant_method.__class__.__name__ == "ModelOptNvFp4FusedMoEMethod"
+        ):
             shard_id = {"w1": "w3", "w3": "w1", "w2": "w2"}[shard_id]
 
         WEIGHT_SCALE_SUPPORTED = [e.value for e in FusedMoeWeightScaleSupported]