Bug: Fix weight loader error when LM head weights are tied (#3766)

python/sglang/srt/models/minicpm3.py

@@ -603,6 +603,8 @@ class MiniCPM3ForCausalLM(nn.Module):
                 # Models trained using ColossalAI may include these tensors in
                 # the checkpoint. Skip them.
                 continue
+            if self.config.tie_word_embeddings and "lm_head.weight" in name:
+                continue
 
             for param_name, weight_name, shard_id in stacked_params_mapping:
                 if weight_name not in name: