[Bugfix] Fix PP tied embeddings weight loading for qwen3.5 4B dense model (#21347)

python/sglang/srt/models/qwen3_5.py

@@ -1384,6 +1384,17 @@ class Qwen3_5ForConditionalGeneration(Qwen3VLForConditionalGeneration):
                 name = name.replace(r"model.language_model.", r"model.")
             if ".self_attn." in name:
                 name = name.replace(".self_attn", "")
+            if (
+                self.config.tie_word_embeddings
+                and self.pp_group.is_last_rank
+                and "model.embed_tokens.weight" in name
+            ):
+                if "lm_head.weight" in params_dict:
+                    lm_head_param = params_dict["lm_head.weight"]
+                    weight_loader = getattr(
+                        lm_head_param, "weight_loader", default_weight_loader
+                    )
+                    weight_loader(lm_head_param, loaded_weight)
             layer_id = get_layer_id(name)
             if (
                 layer_id is not None
@@ -1549,6 +1560,17 @@ class Qwen3_5MoeForConditionalGeneration(Qwen3VLForConditionalGeneration):
                 name = name.replace(r"model.language_model.", r"model.")
             if ".self_attn." in name:
                 name = name.replace(".self_attn", "")
+            if (
+                self.config.tie_word_embeddings
+                and self.pp_group.is_last_rank
+                and "model.embed_tokens.weight" in name
+            ):
+                if "lm_head.weight" in params_dict:
+                    lm_head_param = params_dict["lm_head.weight"]
+                    weight_loader = getattr(
+                        lm_head_param, "weight_loader", default_weight_loader
+                    )
+                    weight_loader(lm_head_param, loaded_weight)
 
             layer_id = get_layer_id(name)
             if (